how many types of SEO's....................................

[addisoncave]

How many types of SEO's are there? Have you heard about Grey Hat SEO?

[jayashree-marg]

There are basically two types of SEO: White hat and Black Hat SEO. Grey Hat SEO is the combination of both White hat and Black Hat SEO.

[othername0104]

White hat and Black Hat SEO ,Gray Hat SEO.

[randiv]

I think there are two types of seo, white hat seo and black hat seo.

[RH-Calvin]

There are basically two types of seo depending on the tasks performed. They are on page and off page seo. On page refers to the building up of the website following webmaster guidelines, whereas off page refers to the promotion techniques used to build your website ranking in search engines.

[damian85]

this answer right here ⇑

[sadianisar]

SEO types are:

On-Page SEO
Off-Page SEO

and others are:
White Hat SEO
Black Hat SEO
Gray Hat SEO