Web Links from the Search Engine's Perspective - Basics Web Link Definition
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When explaining link building to clients, prospects and those interested in listening, I often need to draw a diagram. Diagram 1 portrays three pages A, B and C. Page A links to both page B and page C, however, page C does not link to page A nor does page B link to page A. In addition, you will notice that page B links to page C and page C links to page B.
SEO Link Terms
A term that you will often hear in the SEO community is "reciprocal link." A reciprocal link is an exchange of a link between two pages. In diagram 1, pages B and C would be considered to have a reciprocal link (note: keeping it simple here).
A one-way link is another SEO phrase you will hear. A one-way link is when a page links to another page without a link back from the same page. In diagram 1, a one-way link would be considered the link from page A to page B and the link from Page A to page C.
In Diagram 2, you will see a slightly different link structure between the three pages. Page A links to page B and page B links to page C, as in diagram 1. However, Page A does not link to page C, nor does page C link to page B. Instead we have a non-reciprocated link (or one-way link) from page B to page C and a one-way link from page C to page A.
You should by now notice the triangular fashion in which page A links to page B and page B links page C and page C links to page A. This type of linking is coined "triangular linking."
Link Trading 
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