SEO and indexing basics
Search Engine Optimization (SEO) is a collection of best practices to improve the ranking of webpages on search engine results pages (SERP) for organic search results. Better SERP rankings help your current and potential customers find your content and increase your organic search traffic. SEO best practices are constantly evolving as technology and user behavior change.
A website index is a list of all webpages that a search engine knows about. Indexing, or crawling, is the process for how search engines such as Google create a list of all known webpages. If your web content is not indexed by Google, it cannot appear on a Search Engine Results Page (SERP) when users search in Google. Although search engines use advanced technology to automatically find, crawl, and index your web content, there are extra steps you can take to ensure your content is indexed properly.
For a general overview of SEO techniques, read 8 Ways To Get More Out Of Your Help Center With SEO Best Practices.
How do I know if my website is indexed?
The easiest way to see if your website is in the Google index is to search Google for "site:yourwebsite.com". The search results should contain all your web content that you expect to be indexed.
For more advanced insight into how Google has indexed your website, use Google Webmaster Tools.