USING "OR"

When you're using more than one keyword to do a search, most search engines assume that you included the word "and" when you typed the keywords into the search box, i.e. it finds web sites where all of the words appear in the same site. Therefore, if you want to see all the web sites that contain either one of the keywords, but not necessarily both, you have to tell the computer to do this!  The way to do it is to insert the little word "or" between the keywords, for example:

The search engine will then understand that you're saying

Once again, you could illustrate this using a diagram of two sets showing the sites that will be listed if using this example:

The circle on the left represents all the web sites that the search engine could find containing the word "polar". The circle on the right represents all the web sites that the search engine could find containing the word "bears". The colored area represents all the web sites that contain both keywords.