An
operating
system
(
____________________
)
is
system
____________________
that
manages
computer
____________________
and
software
resources
and
provides
common
services
for
computer
____________________
.
For
hardware
functions
such
as
input
and
output
and
____________________
allocation
,
the
operating
system
acts
as
an
____________________
between
programs
and
the
computer
hardware
,
although
the
application
code
is
usually
executed
directly
by
the
hardware
and
frequently
makes
system
____________________
to
an
OS
function
or
is
____________________
by
it
.
Operating
systems
are
found
on
many
____________________
that
contain
a
computer
?
from
cellular
____________________
and
video
game
____________________
to
web
____________________
and
____________________
.
