Let's start about SEO before we understand SEO .

Search engine optimization(SEO)  - SEO is a technique for using web promotion or other you can say that SEO is a technique for using the web page  visibility on the search engine .

Types of SEO -   Two types

                           (1)  OFF PAGE

                            (2) ON PAGE

(1) OFF PAGE -Off page is a process which is used out of the page .With the help of off page      technique we creat the Back link .Back link is a important role in SEO .

                             (1) Search Engine Submission

                             (2) Directory Submission

                             (3) Book marking Submission

                             (4) Link Wheel

                             (5) Article Submission

                             (6) Classified Submission

                             (7) Blog Posting &Submission

                             (8) Blog Commenting

                             (9) Forum Posting

                             (10) Forum Answering

                             (11)Yahoo Answering

                             (12)Review Posting

(2) ON PAGE -ON Page is a process which is apply on the website .On Page is also helpful in the ranking .

                             (1) Creation & Analysis of Meta Tags

                             (2) Header Tags (H1 ,H2 ,......H6) Analysis

                             (3) Anchor Tags Analysis

                             (4) Title Text Analysis

                             (5) Alt Tags Analysis

                             (6) Content Optimization

                             (7) Competitor Website Analysis 

                             (8) Robots.txt Creation 

                             (9) Google Webmaster Tool Configuration