what is a blog

A blog is like an online diary that you can share with family,friends or whomever and you can also upload pictures, graphics, etc.

A blog is like an on-line journal. You could write any topic you want under the sun as long as it adhere to the rules and regulation of the service provider (for free accounts). You could update it or post your written article as often as you want. It you own the blog, well you could write almost anything and everything you want. And update it as often as you want.

a blog is an online diary, which you can upload images, pictures and write text, perhaps about something that you found interesting about your day/

Why don't you move over to e.g. www.blogger.com and check it out? It's one of the free and most famous provider of blogging service. It's just a website that allows anyone to post easily.