Today we will know, what is SEO? And why is it important for a blog or website. If you want to make your career in blogging, then it is very important for you to know, what is SEO? There are many other activities under Search Engine Optimization, which include On Page and Off Page SEO. If you have a blog, and you write articles on it very well, then that article will not rank in Google until its SEO is not well.