Books Evelyn B. Kelly. A Handbook for Educators. Rosann Jweid and Margaret Rizzo. Teaching Library Media Skills in Middle and Junior High Schools. It provides reviewed documents in a structured format.
Search engines are essentially an index of documents on a portion of the Web.
The engine finds documents on the Web and selects keywords to represent the document in the index. The selection of keywords is done either automatically or manually. With automatic selection, the keywords are words in the document. The algorithm used to select the keywords may concentrate on a portion of the document, such as the title, the first paragraph, the first 20 lines, or even the entire document. For example, the previous paragraph can be automatically parsed to find the keywords for the entire paragraph.