The only thing required for search engine optimization, is having proper knowledge about SEO.

I am agree with rohanferns. The only requirement is knowledge.

The first mandatory thing in SEO is that you must internet expert of online business.
Then you must aware of SEO activities like Off Page SEO and On Page SEO. These are the must two conditions or requirements for SEO.

Other than these there are lots of things you have to do in SEO or apart from SEO like SMO, video Submission PPC, Referrals etc.

Daily work with rotation policy and fresh content are main requirement of SEO.

Please be specific with exactly what do you mean by SEO requirement?

If you want to do SEO then keep your web site search engine friendly and gain quality and reputed back links.

Requirements? nothing a website/webpage and internet must.

Well there are some software for a faster process , but they ask money and its not cheap , anyways for your type of content just check Google for keywords and start linking toward your website.

Only the manin purpose to increase leads/sale

SEO require many think.SEO Two Type ON Page and Off Page.which type of information you want?

you should have deep knowledge os SEO ans some basic knowlegde of development also

This is my first post, SEO are of two types like on-page and off-page.
Off-page includes article submission, forum posting, blog commenting, directory submission.
On-page includes keyword research & analysis, title and meta tag optimization.

Business leads from online sources.

What do you mean? For better business we're doing. May be it's differ for you.

SEO requirement is just quality work, make quality backlink, quality content.

What you want to ask clear your questen please

Some English knowledge and present mind will be enough for seo.

In SEO you just have to knowledge of internet and marketing.

Definition of SEO: Search Engine Optimization. That collection of techniques used to ensure the search engines, especially Google, can find and index your site. The techniques break down in several ways:

On-page and off page. Look on this forum for a LOT of information about these.

Black Hat versus White Hat.

- Black hat tecniques are those disapproved of by the search engines, especially Google, since they are designed to deceive the search engine into indexing something where it should not be indexed.  Black Hat techniques can get your site banned!

- White hat techniques are non-deceptive techniques.

- Grey Hat techniques are somewhere in the middle.  I have been unable to get a good handle on "Grey Hat" techniques, as they seem to vary by intent.

To get a good handle on SEO, go buy a "Complete Idiot's" or "... For Dummies" book on SEO. All the techies I know learn from those books after they have poked around a subject.

What are the requirements of Search Engine Optimization

You don't need special training or techniques,you just have the ability and willingness to learn it's basic,and not be afraid to ask for help.

I agreed with you mafuz62 but please mention that you must follow the Google search engine rule for batter SEO.

good knowlegde, having the ability to choose the good key word and appropriate key word are he basic requirment but there are lot still more..