A "keyword" is the word or words a person types into the search box on a search engine to look up subject matter on the Internet. If you are looking for a flag for your home or office, you might type in "American Flags". The Search Engine screens its database for those web sites it has obtained and looks for the words, "American Flags". Through programming, it then finds and places in order those web sites which it believes to be a match and displays them in order of relevancy. With proper design of a web site, you should have a keyword meta tag area within the head of your html to list the words or "keywords" which best describe your web site. It is important to reflect carefully when choosing your keywords. If you sell boats, but you are only licensed to do so in Maine, then your keywords might best be "boats for sale in Maine" or "Maine Boats", etc.