What is Search Engine Optimization

[Ecstacy]

Search engine optimization is related to online marketing field, the main purpose of SEO is increase business. So there are main two part in SEO.
1- On-page optimization
2- off page optimization

[Die Hard]

Five SEO- definition:
1.   It is the process of improving the volume and quality of traffic to a web site from search engines via "natural" Search.

2.   It is a process that increases the visibility of your site in SERP.

3. It is process to increase the traffic of your site from search engine.

4. It is a process of getting traffic to a "free", "organic", "Editorial", or "natural" is listed on search engines.

5. It is a process to increase your business goal and sale.