<s>
Core	B-Operating_System
Animation	I-Operating_System
is	O
an	O
animation	O
graphics	O
compositing	O
framework	B-Architecture
used	O
by	O
macOS	B-Operating_System
(	O
Mac	B-Application
OS	I-Application
X	I-Application
Leopard	I-Application
and	O
later	O
)	O
,	O
iOS	B-Application
,	O
watchOS	B-Device
,	O
and	O
tvOS	B-Operating_System
to	O
produce	O
animated	O
user	O
interfaces	O
.	O
</s>
<s>
Core	B-Operating_System
Animation	I-Operating_System
provides	O
a	O
way	O
for	O
developers	O
to	O
produce	O
animated	O
user	O
interfaces	O
via	O
an	O
implicit	B-Application
animation	I-Application
model	O
as	O
well	O
as	O
an	O
"	O
explicit	O
"	O
model	O
.	O
</s>
<s>
The	O
developer	O
specifies	O
the	O
original	O
and	O
final	O
states	O
of	O
an	O
object	O
,	O
and	O
Core	B-Operating_System
Animation	I-Operating_System
handles	O
interpolation	B-Algorithm
.	O
</s>
<s>
Core	B-Operating_System
Animation	I-Operating_System
can	O
animate	O
any	O
visual	O
element	O
,	O
and	O
it	O
provides	O
a	O
unified	O
way	O
of	O
accessing	O
Core	B-Operating_System
Image	I-Operating_System
,	O
Core	B-Operating_System
Video	I-Operating_System
,	O
and	O
the	O
other	O
Quartz	B-Operating_System
technologies	I-Operating_System
.	O
</s>
<s>
Core	B-Operating_System
Animation	I-Operating_System
rendering	O
can	O
be	O
accelerated	O
by	O
a	O
graphics	O
processor	O
(	O
GPU	O
)	O
.	O
</s>
<s>
Core	B-Operating_System
Animation	I-Operating_System
first	O
appeared	O
in	O
Mac	B-Application
OS	I-Application
X	I-Application
Leopard	I-Application
,	O
but	O
actually	O
first	O
emerged	O
from	O
the	O
iPhone	B-Device
software	O
team	O
.	O
</s>
<s>
At	O
the	O
Macworld	O
Expo	O
2007	O
,	O
Apple	O
announced	O
that	O
the	O
iPhone	B-Device
runs	O
a	O
specially	O
adapted	O
version	O
of	O
OS	B-Operating_System
X	I-Operating_System
and	O
uses	O
Core	B-Operating_System
Animation	I-Operating_System
.	O
</s>
