<s>
OS	B-Device
X	I-Device
Yosemite	I-Device
(	O
;	O
version	O
10.10	O
)	O
is	O
the	O
eleventh	O
major	O
release	O
of	O
macOS	B-Operating_System
,	O
Apple	O
Inc.	O
'	O
s	O
desktop	O
and	O
server	B-Application
operating	O
system	O
for	O
Macintosh	B-Device
computers	O
.	O
</s>
<s>
OS	B-Device
X	I-Device
Yosemite	I-Device
was	O
announced	O
and	O
released	O
to	O
developers	O
on	O
June	O
2	O
,	O
2014	O
,	O
at	O
WWDC	O
2014	O
and	O
released	O
to	O
public	O
beta	O
testers	O
on	O
July	O
24	O
,	O
2014	O
.	O
</s>
<s>
Following	O
the	O
Northern	O
California	O
landmark-based	O
naming	O
scheme	O
introduced	O
with	O
OS	B-Operating_System
X	I-Operating_System
Mavericks	I-Operating_System
,	O
Yosemite	O
is	O
named	O
after	O
the	O
national	O
park	O
.	O
</s>
<s>
All	O
Macintosh	B-Device
products	O
capable	O
of	O
running	O
OS	B-Operating_System
X	I-Operating_System
Mountain	I-Operating_System
Lion	I-Operating_System
(	O
v10.8.x	O
)	O
are	O
able	O
to	O
run	O
Yosemite	O
as	O
the	O
two	O
operating	O
systems	O
have	O
the	O
same	O
requirements	O
.	O
</s>
<s>
However	O
,	O
to	O
take	O
full	O
advantage	O
of	O
the	O
Handoff	O
feature	O
,	O
additional	O
minimum	O
system	O
requirements	O
include	O
a	O
Mac	O
with	O
Bluetooth	B-General_Concept
LE	I-General_Concept
(	O
Bluetooth	O
4.0	O
)	O
.	O
</s>
<s>
As	O
with	O
Mavericks	B-Operating_System
and	O
Mountain	O
Lion	B-Application
,	O
2GB	O
of	O
RAM	O
,	O
8GB	O
of	O
available	O
storage	O
,	O
and	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
Snow	O
Leopard	B-Application
10.6.8	O
or	O
later	O
are	O
required	O
.	O
</s>
<s>
These	O
are	O
the	O
models	O
that	O
are	O
compatible	O
with	O
OS	B-Device
X	I-Device
Yosemite	I-Device
:	O
</s>
<s>
These	O
are	O
the	O
models	O
that	O
support	O
new	O
features	O
such	O
as	O
Handoff	O
,	O
Instant	O
Hotspot	O
as	O
well	O
as	O
AirDrop	B-Operating_System
between	O
Mac	O
computers	O
and	O
iOS	B-Operating_System
devices	I-Operating_System
:	O
</s>
<s>
Yosemite	O
introduced	O
a	O
major	O
overhaul	O
of	O
OS	B-Operating_System
X	I-Operating_System
's	O
user	B-Application
interface	I-Application
,	O
emphasizing	O
flat	B-Application
graphic	I-Application
design	I-Application
over	O
skeuomorphism	O
,	O
following	O
the	O
aesthetic	O
introduced	O
with	O
iOS	B-Operating_System
7	I-Operating_System
.	O
</s>
<s>
It	O
is	O
the	O
first	O
major	O
redesign	O
of	O
the	O
OS	B-Operating_System
X	I-Operating_System
user	B-Application
interface	I-Application
since	O
10.5	B-Application
Leopard	I-Application
.	O
</s>
<s>
Some	O
icons	O
have	O
been	O
changed	O
to	O
correspond	O
with	O
those	O
of	O
iOS	B-Operating_System
7	I-Operating_System
and	O
iOS	B-Operating_System
8	I-Operating_System
.	O
</s>
<s>
Yosemite	O
maintains	O
the	O
OS	B-Operating_System
X	I-Operating_System
desktop	B-Application
metaphor	I-Application
.	O
</s>
<s>
It	O
was	O
the	O
only	O
macOS	B-Operating_System
version	O
to	O
use	O
Helvetica	O
Neue	O
as	O
the	O
default	O
typeface	O
,	O
as	O
in	O
El	O
Capitan	O
it	O
was	O
again	O
changed	O
,	O
this	O
time	O
to	O
Apple	O
's	O
own	O
,	O
newly-designed	O
San	O
Francisco	O
typeface	O
.	O
</s>
<s>
The	O
Dock	O
is	O
now	O
a	O
2D	O
translucent	O
rectangle	O
instead	O
of	O
a	O
skeuomorphic	O
glass	O
shelf	O
,	O
reminiscent	O
of	O
the	O
Dock	O
design	O
used	O
in	O
early	O
versions	O
of	O
OS	B-Operating_System
X	I-Operating_System
through	O
Tiger	B-Application
and	O
in	O
iOS	B-Application
since	O
iOS	B-Operating_System
7	I-Operating_System
.	O
</s>
<s>
Many	O
of	O
Yosemite	O
's	O
new	O
features	O
focus	O
on	O
the	O
theme	O
of	O
"	O
continuity	O
"	O
,	O
increasing	O
its	O
integration	O
with	O
other	O
Apple	O
platforms	O
and	O
services	O
such	O
as	O
iOS	B-Application
and	O
iCloud	B-Application
.	O
</s>
<s>
The	O
Handoff	O
functionality	O
allows	O
the	O
operating	O
system	O
to	O
integrate	O
with	O
iOS	B-Operating_System
8	I-Operating_System
devices	O
over	O
Bluetooth	B-General_Concept
LE	I-General_Concept
and	O
Wi-Fi	O
;	O
users	O
can	O
place	O
and	O
answer	O
phone	O
calls	O
using	O
their	O
iPhone	B-Device
as	O
a	O
conduit	O
,	O
send	O
and	O
receive	O
text	O
messages	O
,	O
activate	O
personal	O
hotspots	O
,	O
or	O
load	O
items	O
being	O
worked	O
on	O
in	O
a	O
mobile	B-Application
app	I-Application
(	O
such	O
as	O
Mail	B-Operating_System
drafts	O
or	O
Numbers	B-Operating_System
spreadsheets	B-Application
)	O
directly	O
into	O
their	O
desktop	O
equivalent	O
.	O
</s>
<s>
Notification	B-Operating_System
Center	I-Operating_System
features	O
a	O
new	O
"	O
Today	O
"	O
view	O
,	O
similar	O
to	O
that	O
in	O
iOS	B-Application
.	O
</s>
<s>
The	O
Today	O
view	O
can	O
display	O
information	O
and	O
updates	O
from	O
various	O
sources	O
,	O
along	O
with	O
widgets	B-Application
.	O
</s>
<s>
The	O
widgets	B-Application
in	O
the	O
Today	O
view	O
are	O
similar	O
to	O
those	O
of	O
iOS	B-Operating_System
8	I-Operating_System
.	O
</s>
<s>
As	O
of	O
OS	O
X	O
10.10.3	O
,	O
Photos	B-Application
replaces	O
both	O
iPhoto	B-Operating_System
and	O
Aperture	B-Operating_System
.	O
</s>
<s>
It	O
uses	O
iCloud	B-Application
Photo	O
Library	O
to	O
upload	O
all	O
the	O
user	O
's	O
photos	B-Application
across	O
their	O
devices	O
.	O
</s>
<s>
Spotlight	B-Application
is	O
a	O
more	O
prominent	O
part	O
of	O
the	O
operating	O
system	O
;	O
it	O
now	O
displays	O
its	O
search	O
box	O
in	O
the	O
center	O
of	O
the	O
screen	O
and	O
can	O
include	O
results	O
from	O
online	O
sources	O
,	O
including	O
Bing	B-Application
,	O
Maps	B-Application
,	O
and	O
Wikipedia	O
.	O
</s>
<s>
Stock	O
applications	O
such	O
as	O
Safari	B-Application
and	O
Mail	B-Operating_System
have	O
been	O
updated	O
.	O
</s>
<s>
In	O
particular	O
,	O
many	O
security	O
features	O
have	O
been	O
added	O
to	O
Safari	B-Application
,	O
such	O
as	O
a	O
custom	O
history	O
clearing	O
option	O
that	O
lets	O
users	O
clear	O
history	O
,	O
cookies	O
,	O
and	O
other	O
data	O
from	O
the	O
previous	O
hour	O
,	O
day	O
,	O
or	O
two	O
days	O
.	O
</s>
<s>
In	O
addition	O
,	O
Apple	O
added	O
DuckDuckGo	B-Application
to	O
its	O
search	O
offerings	O
,	O
a	O
non-tracking	O
search	O
engine	O
that	O
does	O
n’t	O
store	O
users’	O
data	O
.	O
</s>
<s>
Safari	B-Application
allows	O
you	O
to	O
remotely	O
close	O
tabs	O
from	O
an	O
iOS	B-Operating_System
device	I-Operating_System
.	O
</s>
<s>
Safari	B-Application
now	O
supports	O
browsing	O
in	O
private	O
browsing	O
mode	O
with	O
certain	O
windows	O
(	O
as	O
opposed	O
to	O
all	O
the	O
windows	O
having	O
to	O
be	O
either	O
in	O
or	O
out	O
of	O
private	O
browsing	O
)	O
.	O
</s>
<s>
Instead	O
of	O
simply	O
enlarging	O
the	O
window	O
,	O
the	O
button	O
now	O
enters	O
full-screen	O
mode	O
,	O
eliminating	O
the	O
full-screen	O
button	O
at	O
the	O
top-right	O
corner	O
of	O
windows	O
that	O
has	O
been	O
present	O
since	O
Mac	B-Application
OS	I-Application
X	I-Application
Lion	I-Application
.	O
</s>
<s>
However	O
,	O
holding	O
the	O
Option	B-Device
key	I-Device
( ⌥	O
)	O
while	O
clicking	O
the	O
zoom	O
button	O
or	O
double-clicking	O
on	O
the	O
window	O
chrome	O
continues	O
to	O
invoke	O
the	O
original	O
behavior	O
.	O
</s>
<s>
JavaScript	B-Language
for	O
Automation	O
(	O
JXA	O
)	O
is	O
the	O
new	O
system-wide	O
support	O
for	O
scripting	O
with	O
JavaScript	B-Language
,	O
built	O
upon	O
JavaScriptCore	O
and	O
the	O
Open	O
Scripting	O
Architecture	O
.	O
</s>
<s>
It	O
features	O
an	O
Objective-C	B-Language
bridge	O
which	O
enables	O
entire	O
Cocoa	B-Operating_System
applications	O
to	O
be	O
programmed	O
in	O
JavaScript	B-Language
.	O
</s>
<s>
Along	O
with	O
other	O
framework	O
changes	O
,	O
CloudKit	B-General_Concept
was	O
integrated	O
in	O
this	O
release	O
.	O
</s>
<s>
CloudKit	B-General_Concept
functions	O
as	O
a	O
Mobile	B-Application
Backend	I-Application
as	I-Application
a	I-Application
Service	I-Application
(	O
MBaaS	B-Application
)	O
and	O
is	O
one	O
method	O
for	O
app	B-Application
developers	O
to	O
integrate	O
access	O
to	O
Apple	O
’s	O
iCloud	B-Application
servers	B-Application
into	O
their	O
apps	O
.	O
</s>
<s>
There	O
is	O
a	O
"	O
dark	O
mode	O
"	O
in	O
System	B-Operating_System
Preferences	I-Operating_System
which	O
makes	O
the	O
Dock	O
and	O
menu	O
bar	O
darker	O
.	O
</s>
<s>
Apple	O
initiated	O
a	O
new	O
public	O
beta	O
program	O
for	O
OS	B-Operating_System
X	I-Operating_System
,	O
a	O
practice	O
not	O
seen	O
with	O
its	O
operating	O
systems	O
since	O
2000	O
's	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
Public	I-Operating_System
Beta	I-Operating_System
,	O
which	O
had	O
preceded	O
the	O
release	O
of	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.0	I-Operating_System
.	O
</s>
<s>
Yosemite	O
is	O
part	O
of	O
the	O
OS	B-Operating_System
X	I-Operating_System
Beta	O
Seed	O
Program	O
,	O
a	O
public	O
program	O
that	O
allows	O
the	O
first	O
1	O
million	O
users	O
to	O
download	O
and	O
test	O
the	O
Yosemite	O
beta	O
at	O
no	O
charge	O
.	O
</s>
<s>
On	O
release	O
,	O
Yosemite	O
received	O
positive	O
reviews	O
,	O
with	O
users	O
praising	O
the	O
simplified	O
user	B-Application
interface	I-Application
.	O
</s>
<s>
Programmer	O
John	O
Siracusa	O
,	O
who	O
had	O
reviewed	O
every	O
OS	O
release	O
,	O
wrote	O
for	O
Ars	O
Technica	O
that	O
"	O
Yosemite	O
is	O
an	O
aesthetic	O
one-way	O
valve	O
...	O
switching	O
back	O
to	O
Mavericks	B-Operating_System
after	O
a	O
week	O
or	O
two	O
in	O
Yosemite	O
is	O
like	O
returning	O
to	O
iOS	B-Operating_System
6	I-Operating_System
.	O
</s>
<s>
Because	O
of	O
this	O
,	O
Apple	O
replaced	O
discoveryd	O
with	O
the	O
mDNSResponder	O
system	O
(	O
used	O
in	O
Mavericks	B-Operating_System
)	O
in	O
10.10.4	O
.	O
</s>
<s>
Software	O
developers	O
and	O
users	O
have	O
argued	O
that	O
Apple	O
's	O
yearly	O
release	O
schedule	O
and	O
development	O
practices	O
have	O
compromised	O
stability	O
,	O
and	O
mean	O
that	O
no	O
version	O
of	O
OS	B-Operating_System
X	I-Operating_System
is	O
truly	O
recommendable	O
for	O
users	O
prioritizing	O
reliability	O
over	O
new	O
user	B-Application
interface	I-Application
design	O
and	O
features	O
.	O
</s>
<s>
Spotlight	B-Application
on	O
Yosemite	O
by	O
default	O
reports	O
the	O
user	O
's	O
current	O
location	O
(	O
at	O
the	O
city	O
level	O
)	O
and	O
all	O
their	O
search	O
queries	O
to	O
Apple	O
and	O
third	O
parties	O
.	O
</s>
<s>
Reporting	O
by	O
Spotlight	B-Application
can	O
be	O
disabled	O
by	O
the	O
user	O
,	O
although	O
,	O
even	O
if	O
this	O
is	O
done	O
,	O
the	O
Safari	B-Application
web	I-Application
browser	I-Application
will	O
continue	O
to	O
send	O
search	O
terms	O
to	O
Apple	O
unless	O
the	O
function	O
is	O
separately	O
disabled	O
.	O
</s>
