Algorithm. A set of rules that a search engine uses to rank the pages contained within its index in response to a particular query. No search engine reveals exactly how its algorithm works, to protect itself both from competitors and from those who wish to spam the search engine.Back links. These are links to a website from external sources, including other web pages, directories, and advertising.Banned. When pages are removed from a search engine's index because the search engine has deemed them to be spamming, or violating one of the search engine’s other rules. Click-through rate. How many people clicked on a link, as a percentage of the total number of people that saw the link.

Cloaking. The act of serving content to search engine spiders that is different to what normal visitors would see. Search engines will ban you if they find you doing this.Conversion rate. The percentage of visitors to a website who buy something.Cost per click (CPC). A system where an advertiser pays an agreed amount for each click someone makes on a link leading to their website.Cost per mille (CPM). A system where an advertiser pays an agreed amount for the number of times an ad is seen, regardless of how many people actually click through. The ‘mille’ refers to one thousand viewings of the ad.Directories. A type of search engine where listings are gathered by humans, rather than by automated web crawlers.Index. The collection of information a search engine has that searchers can query.etcThe best advice is to follow a good search engine promotion system. Keep track of when you submit your sites and how soon they’re indexed -- checking once a week is sufficient.