Search Engine Optimisation is a process of getting top rankings in the search engines for most relevant websites search terms. Relevant search terms are phrases that people mostly type into search engine at the time of looking for what the website is offering. These are search terms that are very important to highly rank and these search terms are what SEO targets at. The first step is to select the best search terms that you need for your website, then you allocate few of them to each page within the website that is suitable. What is preferred is one search term page, but even two per page is good. At times it is useful to divide the largest page that covers the topics that are related closely into maybe two or more smaller pages that result in a different search term and they can be targeted on each of them. It is very essential that you match search term pages content.
Search engine ranking system that is based on bids is termed as Pay per click. You can select a search term and then bid a particular amount of money which you need to pay every time you surf on the net and click on your url.