Before to answer to this question we have to know what is difference between a search engine and directory. Here is a brief explanation.
Main difference between search engine and directory lay in way how websites get entered into their index. People submit their sites to directories, which are reviewed by human editors. Think of directories as collections of Internet sites organized by subject. Search engines works by sending out a spider to fetch as many documents as possible. Another program, called an indexer, then reads these documents and creates an index based on words contained in each document.
Having this said, let’s see why you should not submit your site to Search Engines.
More than 90% of search engines traffic comes from three major search engines Google, Yahoo! and MSN.
You can see many ads on Internet which looks like this: “submit your site on X00.000 search engines…”
Submitting your site on hundreds of thousands search engines wouldn’t help and is simply not worth. Save your money as you would do when you see ad’s like: “loose weight while you sleep”.
These three search engines provide results for many other search engines, and if you are listed on these three search engines, your site will be listed on many other search engines too.
Altavista for example show results from Yahoo! index. Rankings are not same, because algorithm is different but index is same. If your site is new and is listed on Yahoo but not on Altavista, be patient and do nothing. Altavista will show your site when they update their index from yahoo. AOL (America On Line) and Netscape use Google index. They additionally receives and listings from DMOZ. Examples are many.
So called “Meta” search engines like DogPile or Metacrawler are showing results from Google and Yahoo among of others. These search engines actually search top search engines and show combined results.
If your site is not new, there is a chance that search engines spiders already find your site and index him. So before to do anything check is your site already listed, even if you did not submit your site on any search engine. But what you should do if your site is just uploaded?
As we already explain search engines are equipped with spiders which will find your site. All you need is to submit your site in Directories, and search engines spiders will find your link and your site will be indexed. But be sure to provide enough “food” for spiders. That is, submit your site in enough directories, and you will make that process shorter.