You can use special searches to see sample results that indicate how your site is indexed by Google. To see a full list of these, use the info: operator, like this: info:google.com. See below for more details on each search type.
See indexed pages in your site
Use the site: operator, like this: site:google.com. (Note: Don't use a space between the operator and the URL.)
You can perform the search on a whole domain or limit it to a certain subdomain or subdirectory—for example, site:google.com/webmasters.
To exclude pages from your search, use a minus sign before the operator. For example, the search site:google.com -site:adwords.google.com gives you all the indexed pages on the google.com domain without the pages from adwords.google.com.
See pages that link to your site's home page
Use link:google.com. (You can use link:google.com or link:www.google.com, but the first search will return more complete results.) You can also search for links to specific pages or directories: link:google.com/webmasters.
See Google's cache of your site
Use the cache: operator to see an archived copy of a page indexed by Google. For example, cache:google.com displays the last indexed version of the Google homepage, along with information about the date the cache was created. You can also view a plain-text version of the page. This is useful because it shows how Googlebot sees the page.
If you don't want searchers to be able to access a cached version of your page, use the noarchive meta tag like this:
<meta name="robots" content="noarchive">
The page will still be crawled and indexed by Google, but users will not see a Cached link in the search results.
See pages that are similar to your site
The related: operator displays websites similar to the site you are looking for. It returns the same results as clicking Similar pages next to a result on our search results page.
This search is like searching a bookstore to find books similar to the first Harry Potter novel. The results could include other children's books, a biography of J.K. Rowling, or a non-fiction book on children's literature. In general, use this operator to find resources that overlap. You'll get the best and most useful results if you use sites that cover a broad range of content.
Google uses several factors to determine the similarity of different sites. However, the quality of the sites returned has no impact on your ranking or on how Google indexes your site.