How do Links help web sites?

The purpose of having various links on the web site is that it enables visitors to easily come right to your web site and be able to click and connect to other web site through that same web site. The advantage that a web site would have if the site was to contain information about other sites and also have supporting links that led the person to those web sites is that web site would be a convenient way for a person to multitask. Therefore majority of the people would prefer to make use of that one web site rather than open several web sites at the same time.

What are Reciprocal Links?
What are One-Way Links?