<s>
Google	B-Application
Play	I-Application
Services	I-Application
is	O
a	O
proprietary	B-Application
software	I-Application
package	O
produced	O
by	O
Google	B-Application
for	O
installation	O
on	O
Android	B-Application
devices	O
.	O
</s>
<s>
It	O
consists	O
of	O
background	O
services	O
and	O
libraries	B-Library
for	O
use	O
by	O
mobile	B-Application
apps	I-Application
running	O
on	O
the	O
device	O
When	O
it	O
was	O
introduced	O
in	O
2012	O
,	O
it	O
provided	O
access	O
to	O
the	O
Google+	O
APIs	O
and	O
OAuth	O
2.0	O
.	O
</s>
<s>
It	O
expanded	O
to	O
cover	O
a	O
variety	O
of	O
Google	B-Application
services	I-Application
,	O
allowing	O
applications	O
to	O
communicate	O
with	O
the	O
services	O
through	O
common	O
means	O
.	O
</s>
<s>
The	O
packages	O
 '	O
services	O
include	O
location	O
tracking	O
and	O
geofencing	O
,	O
single	O
sign-on	O
account	O
services	O
,	O
user	O
health	B-Device
and	I-Device
fitness	I-Device
tracking	I-Device
,	O
payment	O
processing	O
,	O
integrated	O
advertising	O
,	O
and	O
security	O
scanning	O
.	O
</s>
<s>
Many	O
apps	O
on	O
Android	B-Application
devices	O
depend	O
on	O
the	O
use	O
of	O
Google	B-Application
Play	I-Application
Services	I-Application
,	O
and	O
the	O
package	O
requires	O
the	O
user	O
to	O
use	O
a	O
Google	B-Application
Account	I-Application
and	O
agree	O
to	O
Google	B-Application
's	I-Application
terms	O
of	O
service	O
.	O
</s>
<s>
Distributing	O
Google	B-Application
Play	I-Application
Services	I-Application
on	O
an	O
Android	B-Application
device	O
requires	O
a	O
license	O
from	O
Google	B-Application
,	O
which	O
contractually	O
prohibits	O
device	O
producers	O
from	O
producing	O
Android	B-Application
devices	O
that	O
are	O
incompatible	O
with	O
Google	B-Application
's	I-Application
Android	I-Application
specifications	O
.	O
</s>
<s>
Google	B-Application
Play	I-Application
Game	O
Services	O
can	O
be	O
used	O
by	O
application	O
developers	O
to	O
allow	O
a	O
competitive	O
and	O
social	O
experience	O
through	O
the	O
use	O
of	O
leaderboards	O
,	O
achievements	O
,	O
and	O
multiplayer	O
sessions	O
.	O
</s>
<s>
Saved	O
Games	O
API	O
is	O
available	O
to	O
sync	B-Application
game	O
saves	O
on	O
Google	B-Application
's	I-Application
cloud	O
infrastructure	O
.	O
</s>
<s>
The	B-Application
Google	I-Application
Sign-in	O
Android	B-Application
API	O
provides	O
single	O
sign-on	O
,	O
authenticating	O
the	O
user	O
inside	O
applications	O
using	O
Google	B-Application
Account	I-Application
credentials	O
.	O
</s>
<s>
The	B-Application
Google	B-Application
Maps	I-Application
Android	B-Application
API	O
allows	O
applications	O
to	O
include	O
Google	B-Application
Maps	I-Application
or	O
Street	B-Application
View	I-Application
without	O
the	O
need	O
to	O
open	O
a	O
separate	O
application	O
,	O
allowing	O
full	O
control	O
over	O
the	O
camera	O
and	O
providing	O
a	O
means	O
of	O
adding	O
custom	O
markers	O
and	O
map	O
overlays	O
.	O
</s>
<s>
The	B-Application
Google	B-Application
Drive	I-Application
Android	B-Application
API	O
allows	O
Google	B-Application
Drive	I-Application
to	O
be	O
used	O
as	O
a	O
storage	O
structure	O
,	O
providing	O
lookup	O
and	O
syncing	O
of	O
documents	O
along	O
with	O
other	O
file	O
manipulation	O
tools	O
.	O
</s>
<s>
The	B-Application
Google	I-Application
Cast	O
Android	B-Application
API	O
adds	O
casting	O
functionality	O
to	O
allow	O
Android	B-Application
applications	I-Application
to	O
display	O
content	O
on	O
TVs	O
using	O
Google	B-Application
Cast	O
,	O
additionally	O
providing	O
various	O
helpers	O
for	O
common	O
audio	O
,	O
video	O
,	O
and	O
image	O
types	O
.	O
</s>
<s>
Google	B-Application
Mobile	O
Ads	O
integrates	O
advertisements	O
into	O
applications	O
,	O
allowing	O
monetization	O
by	O
targeting	O
ads	O
based	O
on	O
factors	O
such	O
as	O
user	O
location	O
.	O
</s>
<s>
The	B-Application
Google	B-Application
Pay	I-Application
API	O
allows	O
purchases	O
of	O
services	O
and	O
goods	O
via	O
Google	B-Application
Pay	I-Application
.	O
</s>
<s>
Other	O
APIs	O
include	O
the	B-Application
Google	I-Application
Fit	O
API	O
,	O
account	O
authentication	O
methods	O
,	O
and	O
Google	B-Application
Analytics	I-Application
.	O
</s>
<s>
Google	B-Application
Play	I-Application
Services	I-Application
is	O
used	O
by	O
almost	O
all	O
Google	B-Application
apps	O
that	O
have	O
system-level	O
powers	O
.	O
</s>
<s>
All	O
major	O
Android	B-Application
services	O
are	O
controlled	O
by	O
Google	B-Application
Play	I-Application
Services	I-Application
,	O
and	O
many	O
third-party	O
apps	O
also	O
depend	O
on	O
it	O
.	O
</s>
<s>
Without	O
this	O
and	O
its	O
requirement	O
to	O
log	O
in	O
with	O
a	O
Google	B-Application
Account	I-Application
,	O
apps	O
may	O
not	O
work	O
properly	O
.	O
</s>
<s>
Google	B-Application
Play	I-Application
Protect	O
is	O
a	O
unification	O
of	O
Android	B-Application
security	O
systems	O
.	O
</s>
<s>
On	O
November	O
6	O
,	O
2019	O
,	O
Google	B-Application
announced	O
the	O
App	O
Defense	O
Alliance	O
.	O
</s>
<s>
Partners	O
can	O
request	O
Google	B-Application
Play	I-Application
Protect	O
to	O
analyze	O
an	O
app	O
.	O
</s>
<s>
Results	O
are	O
sent	O
to	O
the	O
partner	O
and	O
Google	B-Application
Play	I-Application
Protect	O
receives	O
results	O
from	O
partners	O
.	O
</s>
<s>
Google	B-Application
Play	I-Application
Services	I-Application
is	O
automatically	O
updated	O
through	O
Google	B-Application
Play	I-Application
on	O
devices	O
with	O
Android	B-Application
4.4	I-Application
or	O
newer	O
.	O
</s>
<s>
This	O
means	O
Google	B-Application
can	O
deliver	O
updates	O
without	O
manufacturers	O
having	O
to	O
update	O
the	O
Android	B-Application
firmware	B-Application
,	O
working	O
around	O
the	O
fragmentation	B-Application
of	O
the	O
platform	O
that	O
has	O
become	O
infamous	O
for	O
Android	B-Application
products	O
.	O
</s>
<s>
The	O
Android	B-Application
Open	O
Source	O
Project	O
(	O
AOSP	O
)	O
was	O
announced	O
in	O
2007	O
,	O
and	O
functioned	O
as	O
the	O
baseline	O
system	O
for	O
all	O
OEMs	O
and	O
firmware	B-Application
modifications	O
such	O
as	O
CyanogenMod	B-Application
and	O
LineageOS	B-Application
.	O
</s>
<s>
Various	O
AOSP	O
apps	O
were	O
transferred	O
to	O
Google	B-Application
Play	I-Application
with	O
a	O
closed-source	B-Application
model	O
.	O
</s>
<s>
Many	O
apps	O
(	O
such	O
as	O
Lyft	B-Application
,	O
Uber	B-Application
,	O
and	O
many	O
of	O
the	B-Application
Google	I-Application
apps	O
like	O
Gmail	B-Application
and	O
YouTube	B-General_Concept
)	O
function	O
only	O
when	O
the	B-Application
Google	I-Application
Play	O
Services	O
package	O
is	O
available	O
and	O
enabled	O
.	O
</s>
<s>
Distributing	O
Google	B-Application
Play	I-Application
Services	I-Application
as	O
a	O
part	O
of	O
the	B-Application
Google	I-Application
apps	O
package	O
requires	O
a	O
license	O
from	O
Google	B-Application
,	O
which	O
contractually	O
prohibits	O
device	O
producers	O
from	O
producing	O
Android	B-Application
devices	O
that	O
are	O
incompatible	O
with	O
Google	B-Application
's	I-Application
Android	I-Application
specifications	O
.	O
</s>
<s>
Others	O
who	O
are	O
interested	O
in	O
modifying	O
the	O
Android	B-Application
system	I-Application
are	O
required	O
to	O
either	O
opt-out	O
of	O
Google	B-Application
Play	I-Application
Services	I-Application
or	O
to	O
obtain	O
the	B-Application
Google	I-Application
apps	O
package	O
from	O
either	O
a	O
device	O
that	O
has	O
them	O
pre-installed	O
or	O
an	O
unofficial	O
source	O
.	O
</s>
