Unless you invest a lot in marketing your site. This might happen when the robot follows a link that another site had to your site. In that case you could be included into the searchengines database the robot works for. And of course there is always the possibility that you on not want your site to be visible. In the robots topic we offer tips to prevent your site or certain pages from getting indexed in a searchengine.
Manual submission has certain advantages over automated submission.
The most important one is that you will submit your website to a searchengine according to the procedures of that searchengine, and you can monitor the progression of your listing. The disadvantage is that you can not do that many searchengine submissions as an automated service does. See it as a difference between quality and quantity. Manual URL submission For manual submission of your website, you need to take some actions. Some searchengines want more information like company, address, but also page titles, description and keywords.