<s>
macOS	B-Operating_System
Sierra	I-Operating_System
(	O
version	O
10.12	O
)	O
is	O
the	O
thirteenth	O
major	O
release	O
of	O
macOS	B-Application
(	O
formerly	O
known	O
as	O
and	O
)	O
,	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>
The	O
name	O
"	O
macOS	B-Application
"	O
stems	O
from	O
the	O
intention	O
to	O
uniform	O
the	O
operating	O
system	O
's	O
name	O
with	O
that	O
of	O
iOS	O
,	O
watchOS	O
and	O
tvOS	O
.	O
</s>
<s>
Its	O
major	O
new	O
features	O
concern	O
Continuity	O
,	O
iCloud	B-Application
,	O
and	O
windowing	O
,	O
as	O
well	O
as	O
support	O
for	O
Apple	B-Application
Pay	I-Application
and	O
Siri	B-Application
.	O
</s>
<s>
The	O
first	O
beta	O
of	O
macOS	B-Operating_System
Sierra	I-Operating_System
was	O
released	O
to	O
developers	O
shortly	O
following	O
the	O
2016	O
WWDC	O
keynote	O
on	O
June	O
13	O
,	O
2016	O
.	O
</s>
<s>
It	O
was	O
released	O
to	O
end	O
users	O
on	O
September	O
20	O
,	O
2016	O
,	O
as	O
a	O
free	O
upgrade	O
through	O
the	O
Mac	B-Application
App	I-Application
Store	I-Application
and	O
it	O
was	O
succeeded	O
by	O
macOS	B-Operating_System
High	I-Operating_System
Sierra	I-Operating_System
on	O
September	O
25	O
,	O
2017	O
.	O
</s>
<s>
macOS	B-Operating_System
Sierra	I-Operating_System
requires	O
at	O
least	O
2	O
GB	O
of	O
RAM	B-Architecture
and	O
8	O
GB	O
of	O
storage	O
space	O
and	O
is	O
designed	O
to	O
run	O
on	O
the	O
following	O
products	O
:	O
</s>
<s>
Sierra	O
dropped	O
support	O
for	O
various	O
Macs	O
released	O
from	O
2007	O
to	O
early	O
2009	O
,	O
the	O
first	O
version	O
of	O
macOS	B-Application
since	O
OS	B-Operating_System
X	I-Operating_System
Mountain	I-Operating_System
Lion	I-Operating_System
,	O
released	O
in	O
2012	O
,	O
to	O
do	O
so	O
.	O
</s>
<s>
Support	O
for	O
Xserve	B-Device
was	O
also	O
dropped	O
in	O
Sierra	O
.	O
</s>
<s>
Developers	O
have	O
created	O
workarounds	O
to	O
install	O
macOS	B-Operating_System
Sierra	I-Operating_System
on	O
some	O
Mac	O
computers	O
that	O
are	O
no	O
longer	O
officially	O
supported	O
as	O
long	O
as	O
they	O
are	O
packed	O
with	O
a	O
CPU	O
that	O
supports	O
SSE4.1	O
.	O
</s>
<s>
The	O
user	O
can	O
access	O
the	O
Siri	B-Application
intelligent	O
assistant	O
via	O
the	O
Dock	O
,	O
the	O
menu	O
bar	O
or	O
a	O
keyboard	O
shortcut	O
and	O
results	O
are	O
shown	O
in	O
a	O
window	O
in	O
the	O
upper-right	O
corner	O
.	O
</s>
<s>
Siri	B-Application
can	O
send	O
messages	O
,	O
search	O
the	O
web	O
,	O
find	O
files	O
and	O
adjust	O
settings	O
.	O
</s>
<s>
Results	O
can	O
be	O
dropped	O
into	O
other	O
applications	O
or	O
pinned	O
to	O
Notification	B-Operating_System
Center	I-Operating_System
.	O
</s>
<s>
iCloud	B-Application
Drive	O
can	O
upload	O
the	O
user	O
's	O
documents	O
and	O
desktop	O
directories	O
and	O
sync	O
them	O
to	O
other	O
devices	O
.	O
</s>
<s>
For	O
instance	O
,	O
the	O
user	O
can	O
let	O
the	O
system	O
upload	O
old	O
files	O
to	O
iCloud	B-Application
Drive	O
and	O
remove	O
their	O
local	O
copies	O
,	O
keeping	O
them	O
available	O
on-demand	O
in	O
Finder	B-Application
.	O
</s>
<s>
It	O
can	O
also	O
remove	O
old	O
files	O
from	O
trash	B-Application
automatically	O
.	O
</s>
<s>
iTunes	B-Operating_System
can	O
delete	O
watched	O
,	O
purchased	O
films	O
and	O
TV	O
programs	O
from	O
its	O
library	O
.	O
</s>
<s>
Building	O
upon	O
Continuity	O
,	O
an	O
"	O
umbrella	O
term	O
 [ for ] 	O
features	O
that	O
facilitate	O
the	O
communication	O
between	O
[	O
Apple	O
devices ]	O
"	O
using	O
Bluetooth	B-Protocol
and	O
Wi-Fi	O
,	O
Sierra	O
adds	O
two	O
features	O
.	O
</s>
<s>
With	O
Auto	O
Unlock	O
,	O
the	O
user	O
can	O
unlock	O
their	O
user	O
account	O
by	O
holding	O
a	O
paired	O
Apple	B-Device
Watch	I-Device
close	O
to	O
the	O
device	O
.	O
</s>
<s>
With	O
Universal	O
Clipboard	O
,	O
the	O
user	O
can	O
share	O
the	O
clipboard	O
for	O
cut	B-General_Concept
,	I-General_Concept
copy	I-General_Concept
and	I-General_Concept
paste	I-General_Concept
between	O
macOS	B-Operating_System
Sierra	I-Operating_System
and	O
iOS	B-Operating_System
10	I-Operating_System
devices	O
,	O
including	O
text	O
and	O
rich	O
content	O
,	O
such	O
as	O
pictures	O
or	O
videos	O
.	O
</s>
<s>
Applications	O
that	O
support	O
multiple	O
windows	O
can	O
support	O
multiple	O
tabs	O
within	O
a	O
single	O
window	O
,	O
allowing	O
the	O
user	O
to	O
keep	O
windows	O
organized	O
similarly	O
to	O
Safari	B-Application
.	O
</s>
<s>
Apple	O
released	O
a	O
preview	O
of	O
a	O
new	O
file	B-Application
system	I-Application
in	O
Sierra	O
,	O
called	O
Apple	B-Application
File	I-Application
System	I-Application
(	O
APFS	B-Application
)	O
,	O
to	O
overcome	O
the	O
limitations	O
of	O
HFS	O
Plus	O
.	O
</s>
<s>
It	O
is	O
intended	O
for	O
solid-state	B-Device
drives	I-Device
and	O
flash	B-Device
memory	I-Device
and	O
will	O
adopt	O
several	O
features	O
found	O
in	O
modern	O
file	B-Application
systems	I-Application
,	O
such	O
as	O
snapshots	B-Application
and	O
cloning	O
,	O
as	O
well	O
as	O
native	O
support	O
for	O
features	O
that	O
Apple	O
already	O
provides	O
in	O
HFS	O
Plus	O
through	O
supplementary	O
software	O
,	O
such	O
as	O
file-system	B-Application
encryption	O
and	O
TRIM	O
support	O
.	O
</s>
<s>
The	O
file	B-Application
system	I-Application
was	O
released	O
in	O
macOS	B-Operating_System
High	I-Operating_System
Sierra	I-Operating_System
.	O
</s>
<s>
This	O
can	O
be	O
scheduled	O
in	O
the	O
System	B-Operating_System
Preferences	I-Operating_System
app	O
(	O
in	O
the	O
Displays	O
menu	O
)	O
and	O
can	O
be	O
toggled	O
on	O
or	O
off	O
in	O
the	O
Notification	B-Operating_System
Center	I-Operating_System
or	O
using	O
Siri	B-Application
.	O
</s>
<s>
Since	O
this	O
feature	O
relies	O
on	O
the	O
Metal	O
framework	O
,	O
Night	O
Shift	O
is	O
not	O
available	O
on	O
all	O
systems	O
that	O
support	O
macOS	B-Operating_System
Sierra	I-Operating_System
.	O
</s>
<s>
Apple	O
says	O
it	O
has	O
improved	O
the	O
face	O
recognition	O
of	O
the	O
Photos	B-Application
application	O
,	O
adding	O
object	O
and	O
scene	O
recognition	O
.	O
</s>
<s>
The	O
"	O
People	O
"	O
album	O
organizes	O
photos	B-Application
by	O
the	O
people	O
in	O
them	O
,	O
and	O
Places	O
shows	O
all	O
photos	B-Application
on	O
a	O
world	O
map	O
.	O
</s>
<s>
Safari	B-Application
provides	O
an	O
"	O
extension	O
point	O
"	O
which	O
enables	O
developers	O
to	O
bundle	B-Application
Safari	B-Application
extensions	O
within	O
their	O
Cocoa	B-Operating_System
applications	O
and	O
communicate	O
with	O
them	O
directly	O
from	O
the	O
applications	O
.	O
</s>
<s>
Safari	B-Application
conceals	O
the	O
presence	O
of	O
installed	O
"	O
legacy	O
"	O
plug-ins	B-Application
,	O
such	O
as	O
Adobe	B-Operating_System
Flash	I-Operating_System
Player	I-Operating_System
,	O
Java	B-Application
applets	I-Application
,	O
Microsoft	B-Application
Silverlight	I-Application
,	O
and	O
QuickTime	B-Application
–	O
from	O
websites	O
and	O
requires	O
the	O
user	O
to	O
enable	O
a	O
specific	O
plug-in	B-Application
on	O
a	O
per-use	O
or	O
per-website	O
basis	O
.	O
</s>
<s>
Apple	B-Application
Pay	I-Application
allows	O
vendors	O
to	O
embed	O
an	O
Apple	B-Application
Pay	I-Application
button	O
on	O
their	O
websites	O
.	O
</s>
<s>
In	O
Safari	B-Application
,	O
users	O
can	O
click	O
the	O
Apple	B-Application
Pay	I-Application
button	O
to	O
check	O
out	O
,	O
then	O
complete	O
a	O
purchase	O
using	O
an	O
iPhone	O
or	O
Apple	B-Device
Watch	I-Device
.	O
</s>
<s>
Apple	B-Application
Pay	I-Application
requires	O
a	O
Mac	O
that	O
supports	O
Continuity	O
(	O
2012	O
or	O
later	O
models	O
)	O
and	O
either	O
an	O
iPhone	O
6	O
or	O
later	O
with	O
iOS	B-Operating_System
10	I-Operating_System
,	O
or	O
an	O
Apple	B-Device
Watch	I-Device
with	O
watchOS	O
3	O
.	O
</s>
<s>
The	O
Messages	O
app	O
adds	O
aesthetic	O
effects	O
to	O
messages	O
,	O
such	O
as	O
three	O
times	O
bigger	O
emojis	B-Application
and	O
click	O
back	O
with	O
hearts	O
or	O
thumbs-up	O
on	O
a	O
message	O
bubble	O
.	O
</s>
<s>
The	O
ability	O
to	O
play	O
YouTube	B-General_Concept
videos	I-General_Concept
and	O
preview	O
links	O
in	O
a	O
conversation	O
was	O
introduced	O
.	O
</s>
<s>
Users	O
can	O
view	O
interactive	O
content	O
added	O
to	O
iMessage	O
in	O
iOS	B-Operating_System
10	I-Operating_System
.	O
</s>
<s>
Apple	B-Operating_System
Music	I-Operating_System
within	O
iTunes	B-Operating_System
has	O
been	O
redesigned	O
,	O
making	O
it	O
simpler	O
to	O
find	O
favorite	O
songs	O
and	O
discover	O
new	O
ones	O
.	O
</s>
