Web sites are found by their addresses on the World Wide Web. These addresses are known as URLs, or Uniform Resource Locators. Every website has a URL assigned to it, so both searchers and Web servers can find them quickly and easily.
Cluster analysis or clustering is the task of grouping a set of objects in such a way that objects in the same group (called a cluster) are more similar (in some sense or another) to each other than to those in other groups (clusters).
A concept map can be used as a starting point for processing and selecting information that will be used for later reporting in textual form. Clustering is a technique that organises ideas around a core concept and is an extension of concept mapping. A cluster diagram can be used to draw together aspects of a concept.