<s>
In	O
the	O
client	B-Operating_System
–	I-Operating_System
server	I-Operating_System
model	I-Operating_System
,	O
server-side	B-Application
refers	O
to	O
programs	O
and	O
operations	O
that	O
run	O
on	O
the	O
server	B-Application
.	O
</s>
<s>
This	O
is	O
in	O
contrast	O
to	O
client-side	B-Operating_System
programs	O
and	O
operations	O
which	O
run	O
on	O
the	O
client	B-Protocol
.	O
</s>
<s>
Typically	O
,	O
a	O
server	B-Application
is	O
a	O
computer	B-Application
application	I-Application
,	O
such	O
as	O
a	O
web	B-Application
server	I-Application
,	O
that	O
runs	O
on	O
a	O
remote	O
server	B-Application
,	O
reachable	O
from	O
a	O
user	O
's	O
local	O
computer	O
,	O
smartphone	B-Application
,	O
or	O
other	O
device	O
.	O
</s>
<s>
Operations	O
may	O
be	O
performed	O
server-side	B-Application
because	O
they	O
require	O
access	O
to	O
information	O
or	O
functionality	O
that	O
is	O
not	O
available	O
on	O
the	O
client	B-Protocol
,	O
or	O
because	O
performing	O
such	O
operations	O
on	O
the	O
client	B-Operating_System
side	I-Operating_System
would	O
be	O
slow	O
,	O
unreliable	O
,	O
or	O
insecure	O
.	O
</s>
<s>
Client	B-Protocol
and	O
server	B-Application
programs	O
may	O
be	O
commonly	O
available	O
ones	O
such	O
as	O
free	O
or	O
commercial	O
web	B-Application
servers	I-Application
and	O
web	B-Application
browsers	I-Application
,	O
communicating	O
with	O
each	O
other	O
using	O
standardized	O
protocols	O
.	O
</s>
<s>
Or	O
,	O
programmers	B-Application
may	O
write	O
their	O
own	O
server	B-Application
,	O
client	B-Protocol
,	O
and	O
communications	O
protocol	O
which	O
can	O
only	O
be	O
used	O
with	O
one	O
another	O
.	O
</s>
<s>
Server-side	B-Application
operations	O
include	O
both	O
those	O
that	O
are	O
carried	O
out	O
in	O
response	O
to	O
client	B-Protocol
requests	O
,	O
and	O
non-client-oriented	O
operations	O
such	O
as	O
maintenance	O
tasks	O
.	O
</s>
<s>
In	O
a	O
computer	O
security	O
context	O
,	O
server-side	B-Application
vulnerabilities	O
or	O
attacks	O
refer	O
to	O
those	O
that	O
occur	O
on	O
a	O
server	B-Application
computer	I-Application
system	O
,	O
rather	O
than	O
on	O
the	O
client	B-Operating_System
side	I-Operating_System
,	O
or	O
in	O
between	O
the	O
two	O
.	O
</s>
<s>
For	O
example	O
,	O
an	O
attacker	O
might	O
exploit	O
an	O
SQL	B-Language
injection	I-Language
vulnerability	O
in	O
a	O
web	B-Application
application	I-Application
in	O
order	O
to	O
maliciously	O
change	O
or	O
gain	O
unauthorized	O
access	O
to	O
data	O
in	O
the	O
server	B-Application
's	O
database	O
.	O
</s>
<s>
Alternatively	O
,	O
an	O
attacker	O
might	O
break	O
into	O
a	O
server	B-Application
system	O
using	O
vulnerabilities	O
in	O
the	O
underlying	O
operating	B-General_Concept
system	I-General_Concept
and	O
then	O
be	O
able	O
to	O
access	O
database	O
and	O
other	O
files	O
in	O
the	O
same	O
manner	O
as	O
authorized	O
administrators	O
of	O
the	O
server	B-Application
.	O
</s>
<s>
In	O
the	O
case	O
of	O
distributed	B-Architecture
computing	I-Architecture
projects	O
such	O
as	O
SETI	B-Application
@home	I-Application
and	O
the	O
Great	O
Internet	O
Mersenne	O
Prime	O
Search	O
,	O
while	O
the	O
bulk	O
of	O
the	O
operations	O
occur	O
on	O
the	O
client	B-Operating_System
side	I-Operating_System
,	O
the	O
servers	O
are	O
responsible	O
for	O
coordinating	O
the	O
clients	O
,	O
sending	O
them	O
data	O
to	O
analyze	O
,	O
receiving	O
and	O
storing	O
results	O
,	O
providing	O
reporting	O
functionality	O
to	O
project	O
administrators	O
,	O
etc	O
.	O
</s>
<s>
In	O
the	O
case	O
of	O
an	O
Internet-dependent	O
user	O
application	O
like	O
Google	B-Application
Earth	I-Application
,	O
while	O
querying	O
and	O
display	O
of	O
map	O
data	O
takes	O
place	O
on	O
the	O
client	B-Operating_System
side	I-Operating_System
,	O
the	O
server	B-Application
is	O
responsible	O
for	O
permanent	O
storage	O
of	O
map	O
data	O
,	O
resolving	O
user	O
queries	O
into	O
map	O
data	O
to	O
be	O
returned	O
to	O
the	O
client	B-Protocol
,	O
etc	O
.	O
</s>
<s>
In	O
the	O
context	O
of	O
the	O
World	O
Wide	O
Web	O
,	O
commonly	O
encountered	O
server-side	B-Application
computer	O
languages	O
include	O
:	O
</s>
<s>
However	O
,	O
web	B-Application
applications	I-Application
and	O
services	O
can	O
be	O
implemented	O
in	O
almost	O
any	O
language	O
,	O
as	O
long	O
as	O
they	O
can	O
return	O
data	O
to	O
standards-based	O
web	B-Application
browsers	I-Application
(	O
possibly	O
via	O
intermediary	O
programs	O
)	O
in	O
formats	O
which	O
they	O
can	O
use	O
.	O
</s>
