Once you have built a Web Page, what is it that makes it appear on search engines, such as Google??

I know that when you carry out a Google search, you expect an amount of results that is condusive with how popular what you are searching for is, but how do you appear in the search results at all?

I have just added a news item on our Homepage which I would like to be 'Searchable' on Google and cannot find it for trying, I tried with an older item (over 18 months old) and cannot find that either!!