A search tool finds online information based on criteria you specify or selections you make. Search tools include search engines and search boxes on webpages. The more effectively you use search tools, the more quickly you can find information.

You can refine a web search by using search operators, also called Boolean operators, which are characters, words, or symbols that focus the search.

Mention at lest 4 common search operators and show one example of each. (25 pts per sample)