Blogs have become a great way to be an active part in the cyberspace. A short term for web log, a blog is a personal webpage in which you can share your views on differnet topics, upload videos and pictures, add interesting links, follow other bloggers; and many other possibilities since blogs are so versatile.
Your entries appear in chronological order- from newest to oldest- and others can make comments on them.
To create your blog for free,  you can use  different blog creation sites, such as blogger, wordpress, freewebs, or edublogs.

However, the most important thing is, that a blog has a voice of its own, that is, YOUR voice!!!!

Have a look at this video: