The Keyword META tag is one of the most important META tags. You should place one on each page. When someone types keywords in a search engine like Google, the search engine scans websites for this particular tag and sees if that keyword is in this META Tag. The more relevant your keywords to the search, the higher your ranking (though many other things go into a search rank).
      META Tags don't need a closing tag. Remember that they are placed within the HEAD element of a page:
< HEAD> < META NAME="Keywords" CONTENT="keyword1,keyword2, keyword3 ">
</HEAD>
      Notice first that NAME = "Keywords" This tells the search bot or a browser that this META tag contains the keywords for this Web page.
      Secondly, notice the CONTENT = "keyword1,keyword2". This is the area in which you place all relevant keywords for your page. Make sure you keep these keywords in lower case and that they are seperated by a comma (,). Doing this make sure errors are not being caused.
The Code
So if my webpage was on the Mozart, my keyword tag would look like this: < META NAME="Keywords" CONTENT="musician,musicians,austrian, austria,mozart">
Note: Repeating a keyword over and over, or using hundreds of keywords may cause your web site to be banned by the search engine which thinks you're site is a spam page.