<s>
A	O
linkback	B-Application
is	O
a	O
method	O
for	O
Web	O
authors	O
to	O
obtain	O
notifications	O
when	O
other	O
authors	O
link	O
to	O
one	O
of	O
their	O
documents	O
.	O
</s>
<s>
The	O
four	O
methods	O
(	O
refback	O
,	O
trackback	B-Application
,	O
pingback	B-Application
and	O
webmention	O
)	O
differ	O
in	O
how	O
they	O
accomplish	O
this	O
task	O
.	O
</s>
<s>
"	O
Linkback	B-Application
"	O
is	O
the	O
generalized	O
term	O
used	O
to	O
reference	O
four	O
methods	O
of	O
communication	O
between	O
websites	O
.	O
</s>
<s>
While	O
sometimes	O
confused	O
with	O
one	O
another	O
,	O
linkbacks	B-Application
and	O
backlinks	O
are	O
not	O
the	O
same	O
type	O
of	O
entity	O
.	O
</s>
<s>
A	O
backlink	O
is	O
what	O
the	O
person	O
referring	O
to	O
a	O
page	O
creates	O
while	O
a	O
linkback	B-Application
is	O
what	O
the	O
publisher	O
of	O
the	O
page	O
being	O
referred	O
to	O
receives	O
.	O
</s>
<s>
Any	O
of	O
the	O
four	O
terms	O
—	O
linkback	B-Application
,	O
trackback	B-Application
,	O
pingback	B-Application
,	O
or	O
(	O
rarely	O
)	O
refback	O
—	O
might	O
also	O
refer	O
colloquially	O
to	O
items	O
within	O
a	O
section	O
upon	O
the	O
linked	O
page	O
that	O
display	O
the	O
received	O
notifications	O
,	O
usually	O
along	O
with	O
a	O
reciprocal	O
link	O
;	O
trackback	B-Application
is	O
used	O
most	O
often	O
for	O
this	O
purpose	O
.	O
</s>
<s>
Also	O
,	O
the	O
word	O
trackback	B-Application
is	O
often	O
used	O
colloquially	O
to	O
mean	O
any	O
kind	O
of	O
linkback	B-Application
.	O
</s>
