What is seo ?

Full form of seo is search engine optimization . This means that you are optimizing your website for the search engine .Search engine is not a human it cannot understand the human ways so we are giving information to the search engine in their own way .

the process of maximizing the number of visitors to a particular website by ensuring that the site appears high on the list of results returned by a search engine.

Why search engine optimization is necessary ? 

When you start your website an you want it to be viewed by millions of people this is the best way to do it . If you make a great website and it should be viewed by as many as possible because your creativity and talent should inspire someone or you should get the credit for it .