<s>
Enterprise	B-Application
search	I-Application
is	O
the	O
practice	O
of	O
making	O
content	O
from	O
multiple	O
enterprise-type	O
sources	O
,	O
such	O
as	O
databases	B-Application
and	O
intranets	B-General_Concept
,	O
searchable	B-Application
to	O
a	O
defined	O
audience	O
.	O
</s>
<s>
"	O
Enterprise	B-Application
search	I-Application
"	O
is	O
used	O
to	O
describe	O
the	O
software	O
of	O
search	O
information	O
within	O
an	O
enterprise	O
(	O
though	O
the	O
search	O
function	O
and	O
its	O
results	O
may	O
still	O
be	O
public	O
)	O
.	O
</s>
<s>
Enterprise	B-Application
search	I-Application
can	O
be	O
contrasted	O
with	O
web	B-Application
search	I-Application
,	O
which	O
applies	O
search	O
technology	O
to	O
documents	O
on	O
the	O
open	O
web	O
,	O
and	O
desktop	B-Application
search	I-Application
,	O
which	O
applies	O
search	O
technology	O
to	O
the	O
content	O
on	O
a	O
single	O
computer	O
.	O
</s>
<s>
Enterprise	B-Application
search	I-Application
systems	O
index	B-Application
data	O
and	O
documents	O
from	O
a	O
variety	O
of	O
sources	O
such	O
as	O
:	O
file	B-Application
systems	I-Application
,	O
intranets	B-General_Concept
,	O
document	O
management	O
systems	O
,	O
e-mail	O
,	O
and	O
databases	B-Application
.	O
</s>
<s>
Many	O
enterprise	B-Application
search	I-Application
systems	O
integrate	O
structured	O
and	O
unstructured	B-Application
data	I-Application
in	O
their	O
collections	O
.	O
</s>
<s>
Enterprise	B-Application
search	I-Application
systems	O
also	O
use	O
access	O
controls	O
to	O
enforce	O
a	O
security	O
policy	O
on	O
their	O
users	O
.	O
</s>
<s>
Enterprise	B-Application
search	I-Application
can	O
be	O
seen	O
as	O
a	O
type	O
of	O
vertical	B-Application
search	I-Application
of	O
an	O
enterprise	O
.	O
</s>
<s>
In	O
an	O
enterprise	B-Application
search	I-Application
system	O
,	O
content	O
goes	O
through	O
various	O
phases	O
from	O
source	O
repository	O
to	O
search	B-Application
results	I-Application
:	O
</s>
<s>
In	O
the	O
push	O
model	O
,	O
a	O
source	O
system	O
is	O
integrated	O
with	O
the	O
search	B-Application
engine	I-Application
in	O
such	O
a	O
way	O
that	O
it	O
connects	O
to	O
it	O
and	O
pushes	O
new	O
content	O
directly	O
to	O
its	O
APIs	B-General_Concept
.	O
</s>
<s>
In	O
the	O
pull	O
model	O
,	O
the	O
software	O
gathers	O
content	O
from	O
sources	O
using	O
a	O
connector	O
such	O
as	O
a	O
web	B-Application
crawler	I-Application
or	O
a	O
database	O
connector	O
.	O
</s>
<s>
These	O
may	O
include	O
stemming	B-General_Concept
,	O
lemmatization	B-General_Concept
,	O
synonym	B-Application
expansion	O
,	O
entity	B-General_Concept
extraction	I-General_Concept
,	O
part	O
of	O
speech	O
tagging	O
.	O
</s>
<s>
The	O
resulting	O
text	O
is	O
stored	O
in	O
an	O
index	B-Application
,	O
which	O
is	O
optimized	O
for	O
quick	O
lookups	O
without	O
storing	O
the	O
full	O
text	O
of	O
the	O
document	O
.	O
</s>
<s>
The	O
index	B-Application
may	O
contain	O
the	O
dictionary	O
of	O
all	O
unique	O
words	O
in	O
the	O
corpus	O
as	O
well	O
as	O
information	O
about	O
ranking	O
and	O
term	O
frequency	O
.	O
</s>
<s>
The	O
processed	O
query	O
is	O
then	O
compared	O
to	O
the	O
stored	O
index	B-Application
,	O
and	O
the	O
search	O
system	O
returns	O
results	O
(	O
or	O
"	O
hits	O
"	O
)	O
referencing	O
source	O
documents	O
that	O
match	O
.	O
</s>
