NOT: Search engines allow you to define words shouldn't be present in the search results. For example you want to search for mobile phone reviews and all the results returned are ringtone ads, you can refine your search by adding "-ringtone" and possibly "-free" to remove free ringtone ads in Google and Yahoo Search.

SYNONYMS: Suppose you want to search for obesity disorders. If you type in "obesity ~disorder" in Google then it will match disorder and similar words like treatment and symptoms. M/p>

Part of Tip a day project