PTC (Pay-to-Click) and PTR (Pay-to-Read) programs are based on advertisers that want to pay for their ads to be seen. These programs exist to promote those ads and deliver them to people who will be paid a percentage to watch them.
Ads are placed on a list which you see as soon as you are logged in to your online account. You then have to click those ads and to keep them open in your browser for some time (usually about 30 seconds) in order to get credit for them added to your balance. Its that simple! As soon as you gather significant amount, usually between $5 and $10 you can withdraw your earnings to your AlertPay account and from that, directly to your bank account.