These are also known as Keywords:
When you optimize your webpages, these pages should rank higher in a search-engine return pages (SERPs). Creating a greater likelihood of traffic (visitors) to your site. This is what you want......constant visitor.
There are several methods and opinions about how a webpage should be optimized, with much of it depending on the type of site, it's content, purpose & competition. But in basic search-engine optimization, it relies strongly on the proper use of keywords and keyphrases that describe your sites content.The first place keywords should appear is in the TITLE section of the source code. They should also appear in the Meta description. Here it should be described as accurately as possible, repeating the keywords (just a couple of times). Its a good idea for each subsequent pages, to have their own unique keywords listed in they source code. The page title should use one or more of these unique keywords for maximum search-engine optimization. Since these SEO rely so heavily on keywords, the most important keywords and keyphrases should be used liberally in the first few paragraphs of the content of each page. then sprinkled throughout the body. The last paragraph of every page should be keyword rich, but not over done. A excellent rule of thumb is to reach for keyword density between 5-10%. Caution should be used when using keywords liberally without becoming repetitive. It can also be helpful to use bold or italics on a keyword or two, but not to excessive.
