While many factors influence how search engines rank sites, best practice Search Engine Optimization (also referred to as SEO) starts with search term analysis, well written content, using descriptive and accurate Meta tags and HTML tags, and correct use of links. Blogs, directory listings, social media, and participation in forums can also improve your search rankings. Search engine algorithms are constantly changing. To maintain good rankings web sites should be periodically reviewed and site content updated.
Organic search is also referred to as "natural search". Search engines index pages based on content and relevancy. Unlike paid search organic search is free. Paid search results are the listings that you see on the top and sides of the page. The other results are organic search results.
Meta tags are internal page elements that provide search engine spiders with information about a web page including a page title, description of the page.
Search engines like Google, Bing and Yahoo send out search engine spiders to gather information about web sites. The spiders, also called search engine crawlers or robots, are software programs that "crawl" the world wide web. The information gets indexed into the search engine's database to provide relevant search information to people when they search on the web.