Blog software has made great advances in the past few years.  Blogging is now an activity that every experienced Internet user has tried - at least once!

A blog is an advanced content management system (CMS) for web publishing.  The blog software runs the server based applications to dynamically present your blog information based on the design and style of your blog template or theme. 

The one major consideration you'll want to consider when searching for "blog software" is, "do you really want to manage the software?"  If your an experienced  web user or developer then you'll want the flexibility to change and modify files running on your server.  For many others, you will probably just want to have a blog service provider like TypePad manage the blog cms. 

Many technical users want to manage the blog software themself to save a few dollars each month.  Just remember, the hours you spend doing blog file maintenance might just be worth what you spend on the blog hosting.  

You can also own your domain with a hosted blog cms service.  You basically use their platform to create the blog and then configure the blog to appear on your own unique domain and not a sub-domain of the blog platform provider.