☛ Engine and the directory structure for the website are different and it allows the submission to be done using the engine only.

☛ The submission can take time or it is required to have the instances of the web site to be listed on the search engines.

☛ Submission can only appear on the engines if it is submitted correctly and it provides better visibility of the request.

☛ The engines can be added according to the submissions that are taking place and the calculative chances with the sources.

☛ The engines and directories are put in a queue and add the chance to check the site for the content that is being used.