Search Engine

A search engine is an application used on the Internet to search the Internet for websites. This can be for text data, image data, video data and other specialty functions.

This is used for the collecting process. A limitation however is that you cannot control where the information ot how it is gather only what is gathered. Hence one of the limitations with using secondary material.

Workings
Search engines work by users inputting keywords, then the engine searches their database of indexed sites for the keywords. The results are then displayed to the end user.

Examples:

 * Bing
 * Google Search