Machine Generated 
Don't use software tools that purport to auto-generate doorway pages. These pages are usually devoid of meaningful content. Google, in particular, is working on ways to identify and exclude machine-generated doorway pages.

Manual Submission
Submitting websites by hand to individual search engines and directories.
Submitting to spidering search engines, whether manually or automatically is not necessary.  Submitting to directories may still be a worthwhile practice, and this should always be done manually.
The best approach is not to submit at all and let the search engine spiders find a site through links from other sites.

Meta Description
The Meta description tag is a short sentence of around 12 to 20 words describing the content of the page. Relevant Meta description tags may appear in search results as part of the page description below the page title.

Meta Keywords
The Meta Keyword lists keywords relevant to the page's content. Because so many people abused this tag with spam, this tag provides little or no benefit to search rankings. Many SEO professionals no longer use Meta keywords tags.

Meta Tags
Meta tags are snippets of HTML code on a web page. They offer information about a page (metadata). Meta information may be in the SERPs but is not visible on the page. It is very important to have unique and accurate Meta title and description tags, because they may be the information that the search engines rely upon the most to determine what the page is about. Also, they are the first impression that users get about a page within the SERPs.

Mirror Site
An identical site at a different address.

Monetized Website
To extract income from a site. Adsense ads are an easy way to monetize a website.

Mouseover 
A mouseover is some part of a Web page that causes a change in the page display when the user's mouse passes over it.