I started blogging to help keep in touch with my family and friends

I feel people blog to share their views, thoughts and in the process gain knowledge about a topic, as through blogging you can reach a wide range of audience, also create more opportunites for your business.

Some people blog because they need it. Ex. IT School, Work, etc.

It depends upon the reason of the blogger. But for me, it's my personal diary.

First of all its a really simple yet a good question to ask.
Blogging is basically used for interacting with all the people on this planet to share your thoughts and Knowledge regarding any topic you personally like.

Different people are using Blogs for their various perspective. Some people do blogging because its their Passion, some are doing this for SEO purpose, Some uses for publishing their company News, Some of them are doing it to share their Life events, some of them or doing because they want to be popular, some of them are blogging just for earning purpose etc...

Concluding different people has different view towards blogging..
Hope this make it clear view in your mind.

you do this to promote your online business. traffic means money for online business. so when you got good blog content then you could get allot of traffic.