The payment processors are specialized in the online markets that allow you to send and receive money, they act as virtual banks are known for their reliability, stability and above all safety.
Payment processor is a company (often a third party) appointed by a merchant to handle credit card transactions for merchant acquiring banks.
This term is used to describe the process and service that automates payment transactions between the shopper and merchant.
If you want to make money online, it is more likely that you need to create an account with a payment processor that protects your money and that you can access at any time.
Generally we associate a credit/debit card or bank account with the payment processor of your choice.
If you choose a suitable payment processor will increase your chances of closing a sale and make your business grow.
There are MANY different payment processors these days that are available for handling all of your online money exchanges. Personally, I ONLY use three of them. I believe they are the THREE most commonly preferred out there, too.
You can get FULL information on each, by clicking their name.
I hope this helps your decision when the time comes for you to start accepting payments online.