SEO Myth #1 – I must submit my websites to the Google directory
The idea that for good SEO you need to submit your website to the Google directory for it to appear in SEO search results is not true.
While a brand new website can submit its URL to Google directly, a search engine like Google will still find your site without you submitting it, and Matt Cutts, an SEO expert working for Google, quote explains exactly how this works.
“Even if you do submit your site to Google, a submission does not guarantee anything. Crawlers will find your site and index it in due time, so don’t worry about this idea of needing to “tell” Google about your site.
When you do a Google search, you aren’t actually searching the web. You’re searching Google’s index of the web, or at least as much of it as we can find. We do this with software programs called spiders. Spiders start by fetching a few web pages, then they follow the links on those pages and fetch the pages they point to; and follow all the links on those pages, and fetch the pages they link to, and so on, until we’ve indexed a pretty big chunk of the web; many billions of pages stored on thousands of machines.”
– Matt Cutts in Lesson 1.3 of How Search Works