I'll explain this topic in an easy manner.
SEO - Search Engine Optimization is all about, get the ranking in the google as a first position. And they are three types of SEO:
1. White Hat SEO
2. Black Hat SEO
3. Gray Hat SEO.
- Who is doing SEO for the website by following google algorithms then it's called white hat seo.
- Who isn't following google strategies for doing SEO, then we name it as a black hat seo.
- Who is following both white and black SEO, it's known as gray hat seo.