Money is the most Important thing in everybody's life.
We just search some job from where we can make some money and investing either some money or some time without investing any money we invest our time and earn some money.
So as we are using Internet so much so there are tons of jobs available on net to make some money by utilising our time.
From lot of job Google AdSense is the best programme from where any one can earn money with out investing a single penny.
Here just we have to spend some time and basic knowledge of computer.
Google AdSense search for web spaces where they will show there ads and when any visitor see there ads or click on ads they give some money to the space provider.
so any one can provide google AdSense space in there blog/web site.
So for making money from adsense you must have a well maintained blog/web site.
If you do not want to invest any money for buying a domain name you can make a free blog at www.blogger.com
after creating a blog you write what you like and which things you can write because you will express the things in a better way and then add some image in it to make it beautiful then apply for AdSense publisher account.
They will review your blog/site and if they satisfy then they will approve your account and then you can show AdSense ads on your site and when ever any visitor visit your blog you make money.
But now the main question is why people will visit your blog/site that's true if you are not in the top search engine then it is very difficult to make money from adsense .
so after getting approved from adsense you can work for some sites like www.indiastudychannel.com
where you will write your expressions and articles where they will show ads from your account and as they already have huge traffic you make good money from them .