Search engine optimization (SEO) is the science of making a website ‘search engine friendly.’ The objective of SEO is to increase web site visibility and qualified traffic by ranking highly within search engine results for keyword phrases relating to your site content. There are many factors which can affect search engine ranking. Examples of key factors include:
- Keywords in the domain name
- Keywords in the site's directory and file names
- Page titles and tags: for example, a phrase marked up as an H1 (heading) element was considered to contain keywords relevant to the page
- Ratio of the keyword(s) to other words on the page, the keyword density
- Proximity of individual keywords that appear in the search phrase to each other in the text, also known as "keyword proximity"
- Content of alternate text provided in the form of Alt attributes for images, noframes text for browsers not able to display framed pages, etc
