Blog or weblog is simply a website with frequent updates on a particular subject or topic. You can write a comment, review, suggestion or tip on a subject on your blog. You can also provide educational resources and advice if you are an expert at something. For instance, If your blog is about sport cars. You can post the latest annoucements from sport cars manufacturers such as BMW, Ferrari and so on, discuss about the latest models of sport cars and the best components used for producing sport cars.

Blogger.com allows anyone to create a free blog(free domain name and hosting) without any technical knowledge. Creating a blog with Blogger.com is easy and you can have you blog published within an hours.

There are several ways you can make money with a blog:

Become a Google AdSense publisher
You can join Google AdSense program and start earning advertising revenue from your blog. It is not difficult to set up you AdSense campaign as Blogger.com also provides Adsense tool and guidances to help you start an AdSense campaign. This can be a great source of revenue, though of course the amount of income you can expect from your AdSense ads will depend on the amount of traffic (visitors) to your blog.

Sell Other People's Stuff
You can promote your affiliate programs by placing the affiliate links and banners on your blog and earn commission whenever someone clicks through an affiliate link or banner to your merchant's website made a purchase.

Sell Your Own Product
Blog can be used to promote and sell your own products too. You can write about your products' features and benefits on the blog.

Drive Visitors to You Blog
To make money you need to drive visitors or traffic to your blog. The more traffic you're getting the higher your earning will be. There are several free ways of getting traffic to your blog. Here's how ......

1) Introduce your blog to your family and friends.
2) Submit your blog to directories. You can find a list of blog directories by going to Google and entering the search term 'submit blog url'.
3) Write an article or more with a link to your blog and submit them to article directories. You can find a list of article directories by going to Google and entering the search term 'article directory'.
4) Post messages on community forums with a link to your blog on the signature of each message posted.

There are other ways (free and paid) to increase traffic for your blog. You can find a lot of free information and resources about blog promotion from search engines.