A blog helps you to reach people you can reach in no other way because your frequent updates mean that you'll automatically get niche visitors - those people who have no clue about you or the product that you're selling, but who happened to type in a search engine query that mentioned words you used in a single post. But put in its most simplistic terms a Blog is an online discussion web site that allows both you the web owner and your visitors to voice their opinion on a specific subject.
A business blog can do the SEO magic when it is embedded to your business website. Companies looking to develop a network or community around themselves: as a networking tool, a business blog can help in many different ways but one of its most powerful is when it allows the creation of a network of like minded people interested in a particular area.
With adsense, the truth of the matter is that the blog is a very easy way to make money with Adsense. And the reason being, blogs turn to rank higher on search engines then general websites.
Since Google allows you to add 3 Google Adsense blocks only to one page, no more than that, so I recommend one at the Top, one in the Right or Left sidebar depending on the template you choose and one at the Bottom of your blog. And since with a Adsense blog it is so easy to make quick money because of several reasons ranging from the fact that one does not need to accomplish a sale to earn.
Actually you will quickly learn that there are dozens of ways to make money from your Adsense blog, other than the Adsense program. Many bloggers make the mistake of sticking to Adsense only and are leaving money on the table if they cannot take the time to learn about other alternatives they can use to make cash from their blog.
Political blogs are rampant, and groups of bloggers across the globe post regularly on every topic imaginable. Posters get to see the results of a post immediately, as the post appears simultaneously after posting. And if you have your blog set up correctly, every post will update several pages of your site giving you more readership and revenue.