A blog is a website or web page that is usually updated on a frequent basis by either one person or even a small group of people.  It is usually informal and many conversations are usually created.

I do not have any experience reading or writing blogs.

In a classroom, the teacher can use a blog to keep students up to date.  She can regularly inform the class regarding any material and new information.

http://autismmommytherapist.wordpress.com/