<s>
A	O
mob	B-Protocol
,	O
short	O
for	O
mobile	O
or	O
mobile	O
object	O
,	O
is	O
a	O
computer-controlled	O
non-player	O
character	O
(	O
NPC	O
)	O
in	O
a	O
video	O
game	O
such	O
as	O
an	O
MMORPG	B-Protocol
or	O
MUD	B-Application
.	O
</s>
<s>
Depending	O
on	O
context	O
,	O
every	O
and	O
any	O
such	O
character	O
in	O
a	O
game	O
may	O
be	O
considered	O
to	O
be	O
a	O
"	O
mob	B-Protocol
"	O
,	O
or	O
usage	O
of	O
the	O
term	O
may	O
be	O
limited	O
to	O
hostile	O
NPCs	O
and/or	O
NPCs	O
vulnerable	O
to	O
attack	O
.	O
</s>
<s>
In	O
most	O
modern	O
graphical	O
games	O
,	O
"	O
mob	B-Protocol
"	O
may	O
be	O
used	O
to	O
specifically	O
refer	O
to	O
generic	O
monstrous	O
NPCs	O
that	O
the	O
player	O
is	O
expected	O
to	O
hunt	O
and	O
kill	O
,	O
excluding	O
NPCs	O
that	O
engage	O
in	O
dialog	O
,	O
sell	O
items	O
,	O
or	O
NPCs	O
which	O
cannot	O
be	O
attacked	O
.	O
</s>
<s>
"	O
Named	O
mobs	B-Protocol
"	O
are	O
distinguished	O
by	O
having	O
a	O
proper	O
name	O
rather	O
than	O
being	O
referred	O
to	O
by	O
a	O
general	O
type	O
(	O
"	O
a	O
goblin	O
"	O
,	O
"	O
a	O
citizen	O
"	O
,	O
etc	O
.	O
)	O
.	O
</s>
<s>
Most	O
mobs	B-Protocol
are	O
those	O
capable	O
of	O
no	O
complex	O
behaviors	O
beyond	O
generic	O
programming	O
of	O
attacking	O
or	O
moving	O
around	O
.	O
</s>
<s>
Defeating	O
mobs	B-Protocol
may	O
be	O
required	O
to	O
gather	O
experience	O
points	O
,	O
money	O
,	O
items	O
,	O
or	O
to	O
complete	O
quests	O
.	O
</s>
<s>
Combat	O
between	O
player	O
characters	O
(	O
PCs	O
)	O
and	O
mobs	B-Protocol
is	O
called	O
player	O
versus	O
environment	O
(	O
PvE	O
)	O
.	O
</s>
<s>
PCs	O
may	O
also	O
attack	O
mobs	B-Protocol
because	O
they	O
aggressively	O
attack	O
PCs	O
.	O
</s>
<s>
Monster	B-Protocol
versus	O
monster	B-Protocol
(	O
MvM	O
)	O
battles	O
also	O
take	O
place	O
in	O
some	O
games	O
.	O
</s>
<s>
A	O
game	O
world	O
might	O
contain	O
hundreds	O
of	O
different	O
kinds	O
of	O
mobs	B-Protocol
,	O
but	O
if	O
players	O
spend	O
a	O
certain	O
amount	O
of	O
time	O
playing	O
,	O
they	O
might	O
become	O
well	O
aware	O
of	O
the	O
characteristics	O
presented	O
by	O
each	O
kind	O
and	O
its	O
related	O
hazard	O
.	O
</s>
<s>
The	O
term	O
"	O
mobile	O
object	O
"	O
was	O
used	O
by	O
Richard	O
Bartle	O
for	O
objects	O
that	O
were	O
self-mobile	O
in	O
MUD1	B-Protocol
.	O
</s>
<s>
Later	O
source	O
code	O
in	O
DikuMUD	B-Application
used	O
the	O
term	O
"	O
mobile	O
"	O
to	O
refer	O
to	O
a	O
generic	O
NPC	O
,	O
shortened	O
further	O
to	O
"	O
mob	B-Protocol
"	O
in	O
identifiers	O
.	O
</s>
<s>
DikuMUD	B-Application
was	O
a	O
heavy	O
influence	O
on	O
EverQuest	B-Protocol
,	O
and	O
the	O
term	O
as	O
it	O
exists	O
in	O
MMORPGs	B-Protocol
is	O
derived	O
from	O
the	O
MUD	B-Application
usage	O
..	O
</s>
