Hello guys todays topic is about API ? What API is? What work does API do? How much important API is?

API is basically the Application Programming Interface it is very common term in the computer world. This term id very useful but we don't get more into it. 

You can find many defination about it on wikipedia, and other blogs etc but they arre partically right in this blog I'll hep to get a better understanding about what API actucally is so lets get started :) .

What is API?

"An application programming interface is a computing interface which defines interactions between multiple software intermediaries." from wikipedia.

This is an defination from wikipedia lets learn it through an example.

Example:

API is something which help you to have a seemless connectivity you don't feel that you getting connected with so much thing but the API is actually helping.

Booking an ticket for flight or bus or train online from various sources. Suppose booking ticket for indigo but you book it from paytm,makemytrip.com etc sites there is API working. 

Another Example:

Let's take PUBG when you create an account or ID of yours you use Facebook or Google account to signup. Now When you use facebbok or google ID to ogin PUBG don't ask you to proof that you are geniun person as you already have verifiied to google or facebbok which has cross checked. 

Now, here PUBG is using google API (already return code) and PUBG pays charges to use its service instead of created his own. 

Every user has it's own API KEY which is unique to login into it with this API KEY any other user cannot use your acccount without permission.

Let me know in comment section if any doubt related to it and I hope your basics are clear about API and API key.

THANK YOU :)