Recent studies indicate that 8 out of 10 Web surfers use search engines or directories to find sites.
Search engines scan copies of the pages they find on the web.
These are stored in an index, a database of web pages. When people search, search engine software selects content from database to match what they are looking for. They typically look to see if the search words appear in the title, meta tags and beginning of documents they have indexed. Repetition of terms is another factor, and there are a wide number of other things involved in the mix. Check on things once a month, and if pages are missing, then resubmit.