These pay-per-click ads appear on your blog. Every time somebody clicks on an ad (which is supposed to be about a subject related to your niche), you make a few cents or more. Small amounts each time, but it adds up. This is extremely hands-off. You just need to get a code from Google, place it on your website - and the ads will automatically appear on your blog. Google will only show ads that are relevant to your blog so it's a good experience for your visitors and maximizes the number of clicks you get, meaning more income.
The way I understand it, it is best to join WA if one has a business to promote. The business should ideally be one that he is passionate about or in line with his own interest. He can then use the knowledge and technology learned from WA to build a website concerning his product or service, drive traffic to the website and hopefully, generate sales from his visitors.
Owning and maintaining an online business gives entrepreneurs the freedom to make money remotely from anywhere in the world. The idea is enticing, and more possible than ever, but many entrepreneurs struggle with how to get started. The most important step in starting a profitable online business is finding a business idea that matches your skills and strengths.