1. You get paid for viewing advertisements.
2. You get paid for completing offers which are free of cost to join.
3. You get paid for doing tasks.
4. You get paid for doing Mini jobs.
All of these above mentioned tasks merely 15 - 20 minutes to finish. So if you are a student, you can easily get few dollars per day just by doing these simple tasks.
It's like a part time job for students. Even housewives which are fee at home doing nothing are doing these jobs and earning extra cash.
Now, you are thinking there must be a membership fee for registration.
But, it's completely FREE to join.
Refer as many people as you can so that you will earn some part of their earnings without doing anything.
If you are not able to get it how it's done, see HOW TO CLICK ADS & EARN MONEY WITHOUT INVESTING post