<s>
A	O
newsreader	B-Protocol
is	O
an	O
application	B-Application
program	I-Application
that	O
reads	O
articles	O
on	O
Usenet	B-Application
distributed	O
throughout	O
newsgroups	B-Application
.	O
</s>
<s>
Newsreaders	B-Protocol
act	O
as	O
clients	O
which	O
connect	O
to	O
a	O
news	B-Application
server	I-Application
,	O
via	O
the	O
Network	B-Protocol
News	I-Protocol
Transfer	I-Protocol
Protocol	I-Protocol
(	O
NNTP	B-Protocol
)	O
,	O
to	O
download	O
articles	O
and	O
post	O
new	O
articles	O
.	O
</s>
<s>
In	O
addition	O
to	O
text-based	O
articles	O
,	O
Usenet	B-Application
is	O
also	O
used	O
to	O
distribute	O
binary	O
files	O
,	O
generally	O
in	O
dedicated	O
"	O
binaries	O
"	O
newsgroups	B-Application
.	O
</s>
<s>
The	O
term	O
newsreader	B-Protocol
is	O
sometimes	O
(	O
erroneously	O
)	O
used	O
interchangeably	O
with	O
news	B-Application
aggregator	I-Application
.	O
</s>
<s>
Newsreaders	B-Protocol
that	O
help	O
users	O
to	O
adhere	O
to	O
the	O
established	O
conventions	O
of	O
Usenet	B-Application
,	O
known	O
as	O
netiquette	O
,	O
are	O
evaluated	O
by	O
the	O
Good	B-Protocol
Netkeeping	I-Protocol
Seal	I-Protocol
of	I-Protocol
Approval	I-Protocol
(	O
GNKSA	B-Protocol
)	O
.	O
</s>
<s>
There	O
are	O
several	O
different	O
types	O
of	O
newsreaders	B-Protocol
,	O
depending	O
on	O
the	O
type	O
of	O
service	O
the	O
user	O
needs	O
—	O
whether	O
intended	O
primarily	O
for	O
discussion	O
or	O
for	O
downloading	O
files	O
posted	O
to	O
the	O
alt.binaries	O
hierarchy	O
:	O
</s>
<s>
Designed	O
to	O
integrate	O
well	O
with	O
common	O
GUI	B-Application
environments	O
,	O
and	O
often	O
integrated	O
with	O
a	O
web	B-Application
browser	I-Application
or	O
email	B-Protocol
client	I-Protocol
.	O
</s>
<s>
Examples	O
:	O
Windows	B-Application
Live	I-Application
Mail	I-Application
,	O
Mozilla	B-Application
Thunderbird	I-Application
,	O
Xnews	B-Protocol
,	O
Forté	B-Protocol
Agent	I-Protocol
,	O
Unison	B-Protocol
,	O
Newswatcher	B-Protocol
and	O
Pan	B-Language
.	O
</s>
<s>
Gnus	B-Operating_System
,	O
as	O
well	O
as	O
more	O
specialized	O
newsreaders	B-Protocol
such	O
as	O
slrn	B-Language
,	O
nn	O
and	O
tin	B-Protocol
.	O
</s>
<s>
Although	O
Usenet	B-Application
originally	O
started	O
as	O
a	O
text-based	O
messaging	O
system	O
without	O
any	O
file	O
attachment	O
ability	O
,	O
many	O
Usenet	B-Application
users	O
today	O
do	O
not	O
participate	O
in	O
discussion	O
groups	O
,	O
as	O
was	O
common	O
during	O
the	O
1980s	O
and	O
1990s	O
and	O
only	O
use	O
newsgroups	B-Application
for	O
downloading	O
files	O
such	O
as	O
music	O
,	O
movies	O
,	O
pornography	O
,	O
software	O
and	O
games	O
.	O
</s>
