This is a tool that helps you organize information on the web.

A blog typically has some key traits.

1. RSS – This is a feed that gets broadcast to the world when the blog gets published.
2. Articles called posts – The most notable feature that makes something a blog is that it has more frequent content updates in the form of articles called blog posts.  These are often displayed newest first.

Primarily a blog is a website.  Outside of those two features, there is nothing that makes it different from another website, and even those two features are optional.

This brings up an interesting question.  What is the difference between an online magazine like FastCompany and a blog?

Nothing other than professionalism and effort.  A blog can be used as an online magazine content management system.  The only real difference is the effort.  To do a really great online magazine, you will really need to use many blog plug ins and customize it.  Then you will need a staff of writers and graphic designers.

So what is a blog?

A Blog is a widely accepted form of publishing information on the web  that search engines love.