<s>
CloudKit	B-General_Concept
is	O
an	O
integrated	O
macOS	B-Application
and	O
iOS	B-Application
API	B-Application
that	O
functions	O
as	O
a	O
backend	B-Application
as	I-Application
a	I-Application
service	I-Application
(	O
BaaS	O
)	O
.	O
</s>
<s>
CloudKit	B-General_Concept
is	O
the	O
framework	B-Architecture
that	O
powers	O
iCloud	B-Application
on	O
iOS	B-Application
,	O
macOS	B-Application
and	O
on	O
the	O
web	O
.	O
</s>
<s>
Application	B-Application
developers	I-Application
can	O
utilize	O
CloudKit	B-General_Concept
for	O
integrated	O
access	O
to	O
Apple	O
's	O
iCloud	B-Application
servers	B-Application
into	O
iOS	B-Application
and	O
macOS	B-Application
applications	O
.	O
</s>
<s>
The	O
framework	B-Architecture
provides	O
authentication	O
,	O
a	O
private	O
database	O
,	O
a	O
public	O
database	O
and	O
structured	O
asset	O
storage	O
services	O
allowing	O
developers	B-Application
to	O
focus	O
on	O
client-side	O
development	O
.	O
</s>
<s>
It	O
is	O
the	O
foundation	O
for	O
both	O
iCloud	B-Application
Storage	O
and	O
iCloud	B-Application
Photo	O
Library	O
.	O
</s>
<s>
CloudKit	B-General_Concept
also	O
offers	O
several	O
APIs	B-Application
to	O
access	O
the	O
iCloud	B-Application
Storage	O
,	O
where	O
a	O
user	O
can	O
store	O
data	O
and	O
files	O
so	O
that	O
they	O
can	O
be	O
easily	O
accessible	O
from	O
other	O
devices	O
.	O
</s>
<s>
Developers	B-Application
claim	O
that	O
this	O
framework	B-Architecture
"	O
replaces	O
back-end	O
web	O
services	O
like	O
old-school	O
databases	O
,	O
file	O
storage	O
and	O
user	O
authentication	O
systems.	O
"	O
</s>
