API is an abbreviation for Application-Programming Interface. It includes various elements – tools, sets, routines, and protocols which help build software applications. In short, they are a set of instructions which help software developers access web based tools. There is no user intervention in APIs. It is purely for back end purposes. APIs basically help applications interact with each other.
The simplest example of an API integration is the payment gateway integration on ecommerce sites. While the actual transaction is not seen by the users, the process of transfer of data for verification (your credit card/debit card details) happens because of the payment gateway Application Programming Interface (API) integrated into the website.
The payment gateway integrations we provide include but are not limited to: PayPal, CCAvenue, PayU. We integrate APIs by these vendors to multiple ecommerce owners who wish to sell products on their website.