SEO is the initial for Search Engine Optimization i.e. the process of making a website, search engines friendly. SEO can also refer to an individual person or the industry of consultants who carry out the optimization projects on behalf of their clients.
Is it necessary to make your website a search engines friendly? Good question! If you are running a private website (to be viewed by special people only) or a public website (to be viewed by everyone) your website must be a search engines friendly. You need that friendship for either of these two reasons:-
1. To tell the search engine not to visit your website, in order not to make your website appear in SERP (Search Engine Results Page) or.
2. To invite the search engines robots to index your website for better rank on SERP.
And how will you know that your website is a search engines friendly? It's very easy to spy on your website's friendship with search engines. It's just like human relationship, when you need information about a particular person you go to his/her friend and ask him/her. So here also when you need information about your website relationship with a search engine you go ask the search engine. what you will need to do is just to search for this phrase, site:example.com. After making that search query the result will show every link of your website which has been indexed by that search engine.
Up to here I hope you have understood what SEO is, who SEO is and the importance of the SEO on your website. Latter I will explain more things concerning SEO, Search Engines and website design.