What makes an SEO-Friendly Website?

A website needs visitors to thrive, but with the millions upon millions of sites already in the World Wide Web today, how can your business ever hope to be found, much less reach its target market? This is how search engine optimization or SEO became a highly relevant term and technique in web marketing. SEO allows your site higher visibility through a successful first-page ranking in search engine results pages or SERPs. So how do you make your site SEO-friendly enough for Google or Yahoo (before anyone else) to rank you?