[PageRank]

 SEO is easy. Nothing like difficult knowledge like genetics, nuclear physics...even kids or teenagers are able to become very good SEOers. It's not a hard to learn science/skill.

[WebTech]

SEO is the online-marketing. It helps into increase the bussiness of client. SEO improve the visibility of websites from various search engine.

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[Adeley]

SEO stands for Search Engine Optimization. It helps to improve the visibility of the websites in a search engine. Off page and on page are the two ways used by SEO.

[android45]

Yes if we no the algorithm Right it will be very easy to rank well in search engine.

[SEO]

 No the algorithm? How no the algorithm? Probably you mean "KNOW", not "no" -- know the algorithm.

[carl_mathew]

SEO is the procedure of improving your authority and to get more visitors on your website..

[Robertnielson]

SEO stands for search engine optimization. It is mainly a process of getting more and more traffic on website and thereby affecting the visibility of sites on search engines mainly Google.
It is mainly done to increase the revenue of a website by sending more number of users.
Increasing rank so that it appears on the top page of search results. This helps in attracting more and more target audience. 

[Connect9]

SEO is a technique which helps search engines find and rank your site higher than the millions of other sites in response to a search query.

[SEO]

SEO is also to avoid the duplicate content. Connect9 duplicated the content. Compare the "Posted by: churchwebsite " and the one above. So, now Connect9 is going to join our big ban list.

[AngryBird]

SEO is the abbreviation for search engine optimization, it is the process of increasing the visibility of the website or web page in search engines.

[JoyGirl]

SEO is playing with search engines and web page. It helps to optimize our webpage with high rank.

[MSL]

Very interesting SEO definition, JoyGir!

[LazyCat]

SEO can increase the visibility of a website in natural search results of a search engine. It is a good internet marketing method with so many benefits.

[heartsandal]

yeah seo means search engine optimization... here lot of seo services available, its based on online work.there are two seo available on page seo, off page seo...and also It is the process of getting traffic from the “free,” “organic,” “editorial” or “natural” listings on search engines.

[greenarrow]

In simple words,

SEO is optimizing of website to increase the rank of that website in the search engine rankings.

Optimize : whatever action you do in the site or outbound of the site to improve rankings is optimization in SEO.