<s>
Themes	O
are	O
used	O
to	O
customize	O
the	O
look	B-Application
and	I-Application
feel	I-Application
of	O
a	O
piece	O
of	O
computer	B-Application
software	I-Application
or	O
of	O
an	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
Also	O
known	O
as	O
a	O
skin	O
(	O
or	O
visual	O
style	O
in	O
Windows	B-Application
XP	I-Application
)	O
it	O
is	O
a	O
custom	O
graphical	O
appearance	O
preset	O
package	O
achieved	O
by	O
the	O
use	O
of	O
a	O
graphical	B-Application
user	I-Application
interface	I-Application
(	O
GUI	B-Application
)	O
that	O
can	O
be	O
applied	O
to	O
specific	O
computer	B-Application
software	I-Application
,	O
operating	B-General_Concept
system	I-General_Concept
,	O
and	O
websites	O
to	O
suit	O
the	O
purpose	O
,	O
topic	O
,	O
or	O
tastes	O
of	O
different	O
users	O
.	O
</s>
<s>
As	O
such	O
,	O
a	O
skin	O
can	O
completely	O
change	O
the	O
look	B-Application
and	I-Application
feel	I-Application
and	O
navigation	O
interface	O
of	O
a	O
piece	O
of	O
application	B-Application
software	I-Application
or	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
Software	O
that	O
is	O
capable	O
of	O
having	O
a	O
skin	O
applied	O
is	O
referred	O
to	O
as	O
being	O
skinnable	B-Application
,	O
and	O
the	O
process	O
of	O
writing	O
or	O
applying	O
such	O
a	O
skin	O
is	O
known	O
as	O
skinning	O
.	O
</s>
<s>
Applying	O
a	O
skin	O
changes	O
a	O
piece	O
of	O
software	O
's	O
look	B-Application
and	I-Application
feel	I-Application
—	O
some	O
skins	O
merely	O
make	O
the	O
program	O
more	O
aesthetically	O
pleasing	O
,	O
but	O
others	O
can	O
rearrange	O
elements	O
of	O
the	O
interface	O
,	O
potentially	O
making	O
the	O
program	O
easier	O
to	O
use	O
.	O
</s>
<s>
Themes	O
are	O
often	O
used	O
to	O
change	O
the	O
look	B-Application
and	I-Application
feel	I-Application
of	O
a	O
wide	O
range	O
of	O
things	O
at	O
once	O
,	O
which	O
makes	O
them	O
much	O
less	O
granular	B-Operating_System
than	O
allowing	O
the	O
user	O
to	O
set	O
each	O
option	O
individually	O
.	O
</s>
<s>
One	O
method	O
for	O
dealing	O
with	O
this	O
is	O
to	O
allow	O
the	O
user	O
to	O
select	O
which	O
parts	O
of	O
the	O
theme	O
they	O
want	O
to	O
load	O
;	O
for	O
example	O
in	O
Windows	B-Device
98	I-Device
,	O
users	O
could	O
load	O
the	O
background	O
and	O
screensaver	O
from	O
a	O
theme	O
,	O
but	O
leave	O
the	O
icons	O
and	O
sounds	O
untouched	O
.	O
</s>
<s>
Skins	O
can	O
sometimes	O
include	O
historical	O
incarnations	O
of	O
the	O
player	O
character	O
(	O
such	O
as	O
Insomniac	O
Games	O
 '	O
Spider-Man	B-Device
,	O
which	O
includes	O
unlockable	O
skins	O
based	O
on	O
Spider-Man	B-Device
'	O
s	O
past	O
comic	O
book	O
and	O
film	O
appearances	O
)	O
,	O
as	O
well	O
as	O
crossovers	O
with	O
other	O
video	O
games	O
(	O
such	O
as	O
Final	B-Application
Fantasy	I-Application
XIII-2	I-Application
offering	O
a	O
costume	O
based	O
on	O
Ezio	O
Auditore	O
from	O
the	O
Assassin	B-Application
's	I-Application
Creed	I-Application
franchise	O
,	O
and	O
Super	B-Application
Smash	I-Application
Bros	I-Application
.	I-Application
</s>
<s>
Fortnite	B-Application
Battle	I-Application
Royale	I-Application
has	O
similarly	O
featured	O
extensive	O
uses	O
of	O
licensed	O
properties	O
as	O
the	O
basis	O
for	O
skins	O
,	O
also	O
including	O
non-gaming	O
properties	O
such	O
as	O
comic	O
book	O
characters	O
,	O
the	O
National	O
Football	O
League	O
,	O
and	O
musicians	O
.	O
</s>
<s>
Skins	O
are	O
sometimes	O
distributed	O
as	O
part	O
of	O
downloadable	B-Protocol
content	I-Protocol
,	O
and	O
as	O
pre-order	O
incentives	O
for	O
newly-released	O
games	O
.	O
</s>
<s>
In	O
the	O
2010s	O
,	O
skins	O
were	O
increasingly	O
deemed	O
a	O
virtual	B-General_Concept
good	I-General_Concept
as	O
part	O
of	O
monetization	O
strategies	O
,	O
especially	O
within	O
free-to-play	O
games	O
and	O
those	O
otherwise	O
treated	O
as	O
a	O
service	O
.	O
</s>
<s>
Via	O
the	O
Steam	B-Application
platform	O
,	O
Counter-Strike	B-Application
:	I-Application
Global	I-Application
Offensive	I-Application
and	O
Team	B-Application
Fortress	I-Application
2	I-Application
also	O
allow	O
players	O
to	O
trade	O
these	O
items	O
,	O
which	O
has	O
led	O
to	O
communities	O
devoted	O
to	O
bartering	O
them	O
for	O
real-world	O
money	O
,	O
as	O
well	O
as	O
gambling	O
.	O
</s>
<s>
Microsoft	B-Application
Windows	I-Application
first	O
supported	O
themes	O
in	O
Windows	B-Application
95	I-Application
as	O
a	O
separate	O
application	B-Application
package	I-Application
called	O
Microsoft	O
Plus	O
!	O
</s>
<s>
for	O
Windows	B-Application
95	I-Application
.	O
</s>
<s>
Themes	O
were	O
later	O
supported	O
in	O
Windows	B-Device
98	I-Device
and	O
was	O
built-in	O
there	O
.	O
</s>
<s>
These	O
operating	B-General_Concept
systems	I-General_Concept
,	O
as	O
well	O
as	O
its	O
successor	O
,	O
Windows	B-Device
Me	I-Device
,	O
came	O
with	O
themes	O
that	O
customized	O
desktop	O
backgrounds	O
,	O
icons	O
,	O
user	O
interface	O
colors	O
,	O
Windows	O
sounds	O
and	O
mouse	O
cursors	O
.	O
</s>
<s>
Windows	B-Application
XP	I-Application
expanded	O
Windows	O
theming	O
support	O
by	O
adding	O
visual	B-Device
styles	I-Device
and	O
allowing	O
each	O
theme	O
to	O
specify	O
one	O
.	O
</s>
<s>
This	O
feature	O
was	O
carried	O
over	O
to	O
Windows	B-Application
Vista	I-Application
which	O
added	O
Windows	O
Aero	O
,	O
but	O
was	O
removed	O
with	O
Windows	B-Application
8	I-Application
.	O
</s>
<s>
Third-party	O
apps	O
such	O
as	O
WindowBlinds	B-Application
,	O
TuneUp	B-Application
Utilities	I-Application
and	O
Desktop	B-Application
Architect	I-Application
enhance	O
theme	O
capabilities	O
.	O
</s>
<s>
Linux	B-Application
operating	I-Application
systems	I-Application
may	O
support	O
themes	O
depending	O
on	O
their	O
window	B-Application
managers	I-Application
and	O
desktop	O
environments	O
.	O
</s>
<s>
IceWM	B-Language
uses	O
themes	O
to	O
customize	O
its	O
taskbar	O
,	O
window	O
borders	O
,	O
and	O
time	O
format	O
.	O
</s>
<s>
Window	B-Application
Maker	I-Application
can	O
store	O
colors	O
for	O
icons	O
,	O
menus	O
,	O
and	O
window-borders	O
in	O
a	O
theme	O
,	O
but	O
this	O
is	O
independent	O
of	O
the	O
wallpaper	O
settings	O
.	O
</s>
<s>
GNOME	B-Application
and	O
KDE	B-Application
use	O
two	O
independent	O
sets	O
of	O
themes	O
:	O
one	O
to	O
alter	O
the	O
appearance	O
of	O
user	O
interface	O
elements	O
(	O
such	O
as	O
buttons	O
,	O
scroll	O
bars	O
or	O
list	O
elements	O
)	O
,	O
and	O
another	O
theme	O
to	O
customize	O
the	O
appearance	O
of	O
windows	O
(	O
such	O
as	O
,	O
window	O
borders	O
and	O
title	O
bars	O
)	O
.	O
</s>
<s>
macOS	B-Application
does	O
not	O
natively	O
support	O
themes	O
.	O
</s>
<s>
Third-party	O
apps	O
such	O
as	O
Kaleidoscope	O
and	O
ShapeShifter	B-Application
may	O
add	O
this	O
.	O
</s>
<s>
Although	O
Android	B-Application
does	O
not	O
support	O
themes	O
,	O
the	O
forked	O
CyanogenMod	B-Application
and	O
its	O
successor	O
LineageOS	B-Application
have	O
native	O
theme	O
support	O
.	O
</s>
<s>
The	O
CM	O
theme	O
engine	O
is	O
in	O
turn	O
used	O
on	O
many	O
other	O
forked	O
Android	B-Application
ROMs	O
,	O
such	O
as	O
Paranoid	O
Android	B-Application
.	O
</s>
<s>
Firefox	B-Application
and	O
Google	B-Application
Chrome	I-Application
either	O
support	O
or	O
supported	O
a	O
form	O
of	O
theme	O
.	O
</s>
<s>
Firefox	B-Application
(	O
and	O
its	O
sibling	O
Thunderbird	B-Application
)	O
supports	O
themes	O
either	O
through	O
lightweight	O
themes	O
(	O
formerly	O
Personas	O
)	O
or	O
complete	O
themes	O
.	O
</s>
<s>
While	O
lightweight	O
themes	O
are	O
simply	O
background	O
images	O
for	O
toolbar	O
Firefox	B-Application
toolbars	O
,	O
complete	O
themes	O
have	O
more	O
power	O
to	O
modify	O
Firefox	B-Application
's	O
appearance	O
.	O
</s>
<s>
Google	B-Application
Chrome	I-Application
version	O
3.0	O
or	O
later	O
allows	O
themes	O
to	O
alter	O
the	O
appearance	O
of	O
the	O
browser	O
.	O
</s>
<s>
Internet	B-Protocol
Explorer	I-Protocol
5	I-Protocol
and	O
its	B-Application
immediate	I-Application
successor	I-Application
allowed	O
the	O
background	O
picture	O
of	O
their	O
toolbars	O
to	O
be	O
customized	O
.	O
</s>
<s>
The	O
most	O
popular	O
skins	O
are	O
for	O
instant	B-Application
messaging	I-Application
clients	O
,	O
media	O
center	O
,	O
and	O
media	O
player	O
software	O
,	O
such	O
as	O
Trillian	B-Protocol
and	O
Winamp	B-Application
,	O
due	O
to	O
the	O
association	O
with	O
fun	O
that	O
such	O
programs	O
try	O
to	O
encourage	O
.	O
</s>
<s>
Some	O
platforms	O
support	O
changing	O
the	O
standard	O
interface	O
,	O
including	O
most	O
using	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
.	O
</s>
<s>
For	O
those	O
that	O
do	O
not	O
,	O
programs	O
can	O
add	O
the	O
functionality	O
,	O
like	O
WindowBlinds	B-Application
for	O
Microsoft	B-Application
Windows	I-Application
and	O
ShapeShifter	B-Application
for	O
macOS	B-Application
.	O
</s>
<s>
Many	O
websites	O
are	O
skinnable	B-Application
,	O
particularly	O
those	O
that	O
provide	O
social	O
capabilities	O
.	O
</s>
<s>
As	O
with	O
standalone	O
software	O
interfaces	O
,	O
this	O
is	O
facilitated	O
by	O
the	O
underlying	O
technology	O
of	O
the	O
website	O
—	O
XML	B-Protocol
and	O
XSLT	B-Application
,	O
for	O
instance	O
,	O
facilitate	O
major	O
changes	O
of	O
layout	O
,	O
while	O
CSS	B-Language
can	O
easily	O
produce	O
different	O
visual	B-Device
styles	I-Device
.	O
</s>
