Blog is more preferred for wide extend communication between people who have the same thinking and ideas. You will find blogs on different intellectual matters being shared and written by professors, think tanks and philosophers from different corners of the world. Again the blog is also used for means of entertainment too. The music blogs, movie blogs, song blogs, celebrity blogs are meant for fun and entertainment.
Blog has certain advantages. First it’s very easy to create a blog and update it with content. The articles you update don't need any formatting, mange fonts or other things. This saves a lot of time and you can paste many articles in less time.
The inbuilt CMS in blog makes it easy as you don't have to use the complicated software manually. The blogs are user friendly and with the help of track backs many other blogs can connect you. This again helps you to get rid of tedious link exchange program. The RSS and announcement system helps to keep a track of your blog. You can always attract traffic to your blog with this inbuilt facilities.
When you mean traffic one thing must have come to your mind. Some income? Off course why not? Your blog can generate you revenue if you have really good traffic to your website. Companies and link partners will be willing to pay you good sum of money if you allow their websites to be attached to your blog. Thus you see that there is no end to usage of blogs. Blogs had really brought a revolution to internet usage.