There are millions of them on the Internet and they come in all shapes and sizes. You can write about nearly anything. From what it's like to be a mom to politics. It's free to set one up. Visit http://www.blogger.com/, and once you do, you can place ads, using an easy program like Google AdSense (www.google.com/adsense)
Each time a visitor to your blog clicks on an ad, you earn money.
Once you've earned $100 you'll get a check in the mail for the money you've earned.
You can even look at your AdSense account online to see how much money you've earned Daily!
THIS WOULD BE A GOOD TIME TO CLICK ON MY AD'S...LOL
You probably won't replace your paycheck by blogging, at least not at first, but it's a good way to make extra money.