True search engines have a robot that worms its way through sites on the internet. This indexing sometimes takes weeks to months to happen. We can do this in several ways depending upon the search engine we choose to discuss. Let's look at one that simply uses the way least hard to affect. If we set our sites upon the context, meta tags, and descriptions we can use this information to our best advantage.
Some search engines use link popularity as a way to position web sites in their indexes.
Second, the directories use submittals to supply them with information on web sites. The sites are then approved or disapproved depending upon a human factor. Not much luck there really. This depends on properly submitting in the beginning and have a content that is looked upon favorably in the area you chose to submit. Third, the hybrids use an associated directory format.