What is the difference between a Blog and a Website.?

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I want to make money through online. I have read about Google adsense. I want to you use it on blog/website. I am little bit confuse to make a blog or website. Kindly tell me which is cheapest, and easy. If I want to make a blog, where will I build it, on blog spot, word press, etc. Plz.. plz.. advice me friends, Thanks in advance.