How do search engines find relevant content?

Question

How does Google find relevant content when it\'s parsing the web?

Let\'s say, for instance, Google uses the PHP native DOM Library to parse content. What methods would t

Answer 1

Tricky, but I'll take a stab:

An image (If applicable)

• The first image on the page
• the image with a name that includes the letters "logo"
• the image that renders closest to the top-left (or top-right)
• the image that appears most often on other pages of the site
• an image smaller than some maximum dimensions

A < 255 paragraph from the best slice of text

• contents of the title tag
• contents of the meta content description tag
• contents of the first h1 tag
• contents of the first p tag

Keywords that would be used for our search engine, (stack overflow style)

• substring of the domain name
• substring of the url
• substring of the title tag
• proximity between the term and the most common word on the page and the top of the page

Meta data Keywords,Description, all images, change-log (for moderation and administration purposes)

• ak! gag! Syntax Error.