SEO stands for Search Engine Optimization and has two types ON Page and OFF Page. Simply we can say that the work on own website like content, image with alt tag, url, keywords, website speed, meta tags, sitemap, google analytics code, google webmaster tools etc is called ON Page and OFF Page is process in which we linking our websites url on another websites. There are various types of SEO OFF Page which are below:
1. Directory Submission
2. Social Bookmarking
3. Blog Submission
4. Article Submission
5. Press Release Submission
6. Classified Submission

7. Blog commenting
8. Web 2.0 Submission
9. Local Listing Submission
10. Search Engine Submission
11. PPT Submission
12. Documents Submission
13. PDF Submission
14. RSS Submission
15. Infographics Submission

16. Video Submission
17. Image Share
18. Guest Posting
19. Forum Posting
20. Google Mapping
21. Video promoting