What is Search Engine Submission? Guide me.

There are different types of submission in Off page seo such as
Bookmarking
classified
forum
image
pdf etc

Submitting site link to the different search engines

Google Webmaster Tools. Search engine submission is an effective tool of web promotion. It refers to the direct submission of a website to a search engine. It is a form of internet marketing that helps a webmasters increase the rankings of a web pages or pages.

SEO submission are
bookmarking
classified submission
directory submission
Forum submission