<s>
macOS	B-Device
Catalina	I-Device
(	O
version	O
10.15	O
)	O
is	O
the	O
sixteenth	O
major	O
release	O
of	O
macOS	B-Application
,	O
Apple	O
Inc.	O
'	O
s	O
desktop	O
operating	O
system	O
for	O
Macintosh	B-Device
computers	O
.	O
</s>
<s>
It	O
is	O
the	O
successor	O
to	O
macOS	B-Device
Mojave	I-Device
and	O
was	O
announced	O
at	O
WWDC	O
2019	O
on	O
June	O
3	O
,	O
2019	O
and	O
released	O
to	O
the	O
public	O
on	O
October	O
7	O
,	O
2019	O
.	O
</s>
<s>
Catalina	O
is	O
the	O
first	O
version	O
of	O
macOS	B-Application
to	O
support	O
only	O
64-bit	B-Device
applications	O
and	O
the	O
first	O
to	O
include	O
Activation	O
Lock	O
.	O
</s>
<s>
It	O
is	O
also	O
the	O
last	O
version	O
of	O
macOS	B-Application
to	O
have	O
the	O
major	O
version	O
number	O
of	O
10	O
;	O
its	O
successor	O
,	O
Big	B-Operating_System
Sur	I-Operating_System
,	O
released	O
on	O
November	O
12	O
,	O
2020	O
,	O
is	O
version	O
11	O
.	O
</s>
<s>
In	O
order	O
to	O
increase	O
web	O
compatibility	O
,	O
Safari	B-Application
,	O
Chromium	B-Language
and	O
Firefox	B-Application
have	O
frozen	O
the	O
OS	O
in	O
the	O
user	O
agent	O
running	O
in	O
subsequent	O
releases	O
of	O
macOS	B-Application
at	O
10.15.7	O
Catalina	O
.	O
</s>
<s>
macOS	B-Device
Catalina	I-Device
officially	O
runs	O
on	O
all	O
standard	O
configuration	O
Macs	O
that	O
supported	O
Mojave	B-Device
.	O
</s>
<s>
2010	O
–	O
2012	O
Mac	B-Device
Pros	I-Device
,	O
which	O
could	O
run	O
Mojave	B-Device
only	O
with	O
a	O
GPU	B-Architecture
upgrade	O
,	O
are	O
no	O
longer	O
supported	O
.	O
</s>
<s>
Catalina	O
requires	O
4	O
GB	O
of	O
memory	O
,	O
an	O
increase	O
over	O
the	O
2	O
GB	O
required	O
by	O
Lion	B-Application
through	O
Mojave	B-Device
.	O
</s>
<s>
It	O
is	O
possible	O
to	O
install	O
Catalina	O
on	O
many	O
older	O
Macintosh	B-Device
computers	O
that	O
are	O
not	O
officially	O
supported	O
by	O
Apple	O
.	O
</s>
<s>
Catalyst	O
is	O
a	O
new	O
software-development	O
tool	O
that	O
allows	O
developers	O
to	O
write	O
apps	O
that	O
can	O
run	O
on	O
macOS	B-Application
,	O
iOS	B-Application
and	O
iPadOS	B-Operating_System
.	O
</s>
<s>
Apple	O
demonstrated	O
several	O
ported	O
apps	O
,	O
including	O
Jira	B-Protocol
and	O
Twitter	B-Application
(	O
after	O
the	O
latter	O
discontinued	O
its	O
macOS	B-Application
app	O
in	O
February	O
2018	O
)	O
.	O
</s>
<s>
An	O
upgrade	O
from	O
Kexts	B-Application
.	O
</s>
<s>
System	O
extensions	O
avoid	O
the	O
problems	O
of	O
Kexts	B-Application
.	O
</s>
<s>
Catalina	O
will	O
be	O
the	O
last	O
version	O
of	O
macOS	B-Application
to	O
support	O
legacy	O
system	O
extensions	O
.	O
</s>
<s>
Mac	O
apps	O
,	O
installer	O
packages	O
,	O
and	O
kernel	B-Application
extensions	I-Application
that	O
are	O
signed	O
with	O
a	O
Developer	O
ID	O
must	O
be	O
notarized	O
by	O
Apple	O
to	O
run	O
on	O
macOS	B-Device
Catalina	I-Device
.	O
</s>
<s>
Activation	O
Lock	O
helps	O
prevent	O
the	O
unauthorized	O
use	O
and	O
drive	O
erasure	O
of	O
devices	O
with	O
an	O
Apple	O
T2	O
security	O
chip	O
(	O
2018	O
,	O
2019	O
,	O
and	O
2020	O
MacBook	B-Device
Pro	I-Device
;	O
2020	O
5K	O
iMac	B-Device
;	O
2018	O
,	O
2019	O
,	O
and	O
2020	O
MacBook	B-Device
Air	I-Device
,	O
iMac	B-Device
Pro	I-Device
;	O
2018	O
Mac	B-Device
Mini	I-Device
;	O
2019	O
Mac	B-Device
Pro	I-Device
)	O
.	O
</s>
<s>
Sidecar	O
allows	O
a	O
Mac	O
to	O
use	O
an	O
iPad	B-Device
(	O
running	O
iPadOS	B-Operating_System
)	O
as	O
a	O
wireless	O
external	O
display	O
.	O
</s>
<s>
With	O
Apple	B-Device
Pencil	I-Device
,	O
the	O
device	O
can	O
also	O
be	O
used	O
as	O
a	O
graphics	B-Device
tablet	I-Device
for	O
software	O
running	O
on	O
the	O
computer	O
.	O
</s>
<s>
Sidecar	O
requires	O
a	O
Mac	O
with	O
Intel	B-Architecture
Skylake	I-Architecture
CPUs	O
and	O
newer	O
(	O
such	O
as	O
the	O
fourth-generation	O
MacBook	B-Device
Pro	I-Device
)	O
,	O
and	O
an	O
iPad	B-Device
that	O
supports	O
Apple	B-Device
Pencil	I-Device
.	O
</s>
<s>
The	O
Game	O
Controller	O
framework	O
adds	O
support	O
for	O
two	O
major	O
console	O
game	O
controllers	O
:	O
the	B-Operating_System
PlayStation	I-Operating_System
4	I-Operating_System
's	O
DualShock	B-Device
4	I-Device
and	O
the	O
Xbox	B-Device
One	I-Device
controller	I-Device
.	O
</s>
<s>
For	O
example	O
,	O
the	O
manner	O
in	O
which	O
backup	O
data	O
is	O
stored	O
on	O
network-attached	O
devices	O
was	O
changed	O
,	O
and	O
this	O
change	O
is	O
not	O
backwards-compatible	O
with	O
earlier	O
versions	B-Operating_System
of	I-Operating_System
macOS	I-Operating_System
.	O
</s>
<s>
iTunes	B-Operating_System
is	O
replaced	O
by	O
separate	O
Music	B-Operating_System
,	O
Podcasts	B-Operating_System
,	O
TV	B-Operating_System
and	O
Books	B-Application
apps	O
,	O
in	O
line	O
with	O
iOS	B-Application
.	O
</s>
<s>
iOS	B-Operating_System
device	I-Operating_System
management	O
is	O
now	O
conducted	O
via	O
Finder	B-Application
.	O
</s>
<s>
The	O
TV	B-Operating_System
app	O
on	O
Mac	O
supports	O
Dolby	O
Atmos	O
,	O
Dolby	B-Device
Vision	I-Device
,	O
and	O
HDR10	B-Device
on	O
MacBooks	B-Device
released	O
in	O
2018	O
or	O
later	O
,	O
while	O
4K	O
HDR	O
playback	O
is	O
supported	O
on	O
Macs	O
released	O
in	O
2018	O
or	O
later	O
when	O
connected	O
to	O
a	O
compatible	O
display	O
.	O
</s>
<s>
Find	B-Operating_System
My	I-Operating_System
Mac	I-Operating_System
and	O
Find	B-Operating_System
My	I-Operating_System
Friends	I-Operating_System
are	O
merged	O
into	O
an	O
application	O
called	O
Find	B-Operating_System
My	I-Operating_System
.	O
</s>
