Direct Traffic

Direct Traffic:

The Traffice you get when someone open your website/blog by puting your website/blog adddress to his browser.

So "Direct Traffic" is better.

Referral Traffic

Referral Traffic: 

The Traffice you get from other blog/website by placing your link on other website/blog then this traffic that is called ‘Referral traffic’

Type of Referral Traffic:
"Free Referral Traffic" and "Paid Referral Traffic"

Free Referral Traffic:
The traffic you get by changing your link with another blog/website.

Paid Referral Traffic:
The Traffice you get by placing your link with another blog/website and pay to wedsite/blog owner for your link.

Organic Traffic

Organic Traffic: 

The traffic from different Search Engines like Google, Yahoo, and Bing etc. is called Organic Traffic.

Type of Organic Traffic:
   "Free Organic Traffic" and "Paid Organic Traffic"

  1 Free Organic Traffic:
      The traffic you get from Search Engines without paying money is called "Free Organic Traffic"

  2 Paid Organic Traffic:
      If you are using any paid service like ‘Google Adwords’ for traffic is called "Paid Organic Traffic"