Keywords are those character strings used to search for information within search engines, about a particular subject. Keyword types are varied: they can be singular, plural, strong or weak, global or local, misspelled, seasonal, or long tail.
You search them in Google, but how do you know the number of searches for that keyword or the number of visits to your website or the number of competing sites for the same keyword?
You need a keyword research tool. The tool will pull data directly from Google. Curious? Give it a try.