Link Building
Inbound linking: Building of links within the website i.e. inclusions of various links on different pages irrespective of relevancy. These types of links are also, known as Reciprocal links.
Outbound linking: At times, in order to increase the popularity of the website under the circumstances of mutual understanding websites exchange links thus, leading to higher ranks in the search engines. This exchange of links can also be done on the payment basis. This exchange of links with other sites is often known as Outbound linking.