tell me some thing about SEO?

[Rashida G]

Algorithm
An algorithm is a set of finite, ordered steps for solving a mathematical problem. Each Search Engine uses a proprietary algorithm set to calculate the relevance of its indexed web pages to your particular Query. The result of this process is a list of sites ranked in the order that the search engine deemed most relevant. Search engine algorithms are closely guarded in order to prevent exploitation of algorithmic results. Search algorithms are also changed frequently to incorporate new data and improve relevancy.

Algorithmic Results
Algorithmic results are the ranked listings search engines provide in response to a Query. They are often referred to as Organic Listings in contrast to Paid Listings because their rank is based on relevancy rather than advertising revenue paid to the search engine. However, paid listings do appear alongside algorithmic results in many search engines, provided they are relevant. Improving a website’s unpaid algorithmic results is known as Natural Search Engine Optimization