Blog is is a website where entries are commonly displayed in reverse chronological order. “Blog” can also be used as a verb, meaning to maintain or add content to a blog. It’s also can be mean online diary .

To have blog you can have it for free for example

1. Blogger : http://www.blogger.com .. It’s free and you can use to make money online by using google adsense code …

2. wordpress : http://www.wordpress.com .. with this website you can make blog which is more nice … but you can’t make money online with it .. because you can’t use google adsense code in that website …