Seo is actually the process of improving ranking in search engine result. Backlinks are Incoming links to a site, blog, hub or to web page. the number of backlinks is essential to determine the popularity or importance of that website, blog or page.many people ask themselves how we can get these backlinks. There are many ways to ways to build backlinks; you can purchase links, use social media Getting Listed in Directories or articles directories. So how can we do right seo and get some useful backlinks?

1- Hubpage

2- Squidoo

3-Linkedln

4- Myspace

5- Facebook

6- Live space

7- Yahoo 360

8- Yahoo answers

9- Google groups

10- Yahoo groups

11- About.com

12- Digg

13- Wikipedia

14- Reddit

15- Stumbleupon

16- Mix

17- twitter

1- Ezine articles

2- Article dashboard

3- Howhub

4- Goarticles

5- Infospreads

6- Articlebase

7- Sooper articles

8- Search warp

There are also many ways and tools such as the unique article wizard to submit articles. The unique article wizard is a great tool to submit articles to multiple directories but unfortunately this tool is not for free.

1- DMOZ- for free

2- Yahoo directory- 299$ per year

3- Microsoft bcentral- 49$ per year

4- Starting point – 99$ per year

5- Jayde- for free

dmoz is the biggest directory, although it is take long time to submit your site, it's worth the effort.

1- Best of the web blogs

2- Blog hub

3- We blog a lot

4- Google blogs

good luck.....