Why do you have a blog?

This is a question I've been meaning to answer for some time now and is one which I think is relevant to anyone who has a blog or wishes to create one.
I am new to the world of blogging having only blogged for the last month or so, but I feel that it relates to all of us in the blogging community.
The reason why I blog is to analyse literature, practice my essay writing, generate debate, spark interest, invite new ideas and recommendations and to free my mind of whatever is going on in my head at the time.
Some people think having a blog is 'pointless' and 'obnoxious', but I think it is one of the best things I have ever done; not only is it a useful tool for my English Literature degree but it introduces me to so many different blogs which I never even knew were out there. I've learnt new techniques through the designing my website and discovered how to track statistics. I've also viewed some great blogs which are completely different from my own, such as blogs which include recipes, fashion, business and music.
There are thousands of blogs out there and if you are wondering whether you should start a blog or not, I wouldstrongly urge you to say yes! It is a great way to widen your knowledge and possibly attract exciting job opportunities.

If you have a blog, or are thinking of creating one, what do you want your blog to say to your readers?