<s>
Core	B-Operating_System
Services	I-Operating_System
are	O
a	O
set	O
of	O
macOS	B-Application
and	O
iOS	B-Application
application	B-Application
programming	I-Application
interfaces	I-Application
that	O
architecturally	O
are	O
underneath	O
Carbon	B-Operating_System
,	O
Cocoa	B-Operating_System
and	O
Cocoa	B-Operating_System
Touch	I-Operating_System
.	O
</s>
<s>
In	O
addition	O
to	O
Core	B-Operating_System
Foundation	I-Operating_System
,	O
it	O
also	O
encompasses	O
other	O
APIs	B-Application
including	O
Grand	B-Operating_System
Central	I-Operating_System
Dispatch	I-Operating_System
,	O
Blocks	B-Language
,	O
CFNetwork	O
,	O
CarbonCore	O
,	O
OSServices	O
,	O
and	O
WebServicesCore	O
.	O
</s>
