Meta data on a Web page is invisible to the surfer, it doesn't actually show on the screen but lurks in the dark corners where only the creepy crawlers go.
Crawlers (or robots) are programs used by search engines to index sites on the web. They roam freely and when they coma a-knocking at your door, they read the meta tags as well as the text on you page and when somebody enters keywords in a search engine to find relevant information, that's how it is found.
There are lots of different kinds of meta tags, some more useful than others, and to help you build your own custom meta tag list, you can use the free tool at FireFactor that does most of the hard work for you. All you have to do is supply some basic information about your page, and Meta tag generator writes the code for you ready to copy and paste into your markup.
FireFactor Meta tag generator will help make your information more easy to find on search engines.