BACKLINKS

Backlink is when we links is place is some other website in clickable link format link is called 
as backlink.It is also called as Inbound Backlink.
There are three types of backlink
(a) one way backlink
(b) two way backlink
(c) three way backlink

(a) One way backlink

One way backlink is give our webpage link to some other website it should be clickable link  format is called as one way backlink.
ex if A.com is one site if we want to give backlink of A.com then we have to place it some other website B.com then this link farmed as one way backlink.

(b) Two way backlink

In two way backlink we have to exchange the link exchanging the link two website this process is 
called as two way backlink.
ex if we want to get backlink A.com then we have link place some other website suppose on B.com in we have to place our link in B.com then exchange link place B.com on A.com exchanging is happening in two website so this process is called the two way backlink.

(c) Three way backlink

In three way backlink exchanging the links between three website is called the three way backlink.
ex A.com place B.com then B.com also place some other website in clickable link format this process is called the three way backlink.