What is an Application Programming Interface (API)?

An API, or Application Programming Interface allows various software programs to communicate with each other. It behaves like a bridge that allows data to be shared and functions to be used across applications. APIs make it easier for developers to integrate and enhance the features of their software quickly and efficiently.

What is API?

You might be familiar with the term API, commonly used in tech language, as it plays a crucial role in the world of technology. So, what is an API? API stands for Application programming interface. Sounds complex? 

Let’s simplify it for you. Imagine you’re at a restaurant, you interact with the waiter to place your order, whereas you know that the food is prepared by the chef. Now in this example, think of the waiter as the API connecting the communication between you (the user) and the kitchen (the system)

Similarly, the API serves as a mediator in the digital world enabling different software systems to interact and communicate with each other. Simply put, it serves as a middleman that allows two applications to talk to one another. 

APIs are all around you. Whenever you use any cab booking app, use a social media app, or check the weather on your phone, you’re using an API.

Types of Application Programming Interface

Types of APIs

1- Web APIs

APIs accessed over the internet using the HTTP protocols are called web APIs. With these APIs, applications can interact with each other via standard web technologies. Services can also communicate and share data smoothly.

2- Library-Based APIs

Library-based APIs are also known as class libraries or framework APIs, developers can use the functions and procedures provided by it to simplify the complicated tasks within their code. 

3- Operating System APIs

With operating system APIs, applications can access the underlying resources and functionalities of any operating system. Programmers can use these APIs to write applications that communicate with file systems, hardware, and other system resources.

4- Hardware APIs

With APIs, software programs can interact with hardware devices like printers, cameras, sensors, and more. Developers may also integrate the capabilities of such devices into their apps by utilizing hardware APIs

Why Are APIs Important?

Why should you care about APIs? Well here’s the reason:

1- API is super efficient as it streamlines the development process with pre-built functionalities, saving the developers’ time and effort.

2- APIs empower different software systems to work smoothly, promoting compatibility and collaboration.

3- APIs promote creativity and the development of new services and apps by making features available to outside developers.

How Does An API Work?

So, APIs share data among applications, systems, and devices. It works on a response and request cycle. The request is sent to the API which retrieves the data and returns it to the user. Let’s look at its overview to know how this process works.

  • Request

The client makes a request such as wanting data from the server or sending data to be processed. You can relate it to ordering a dish from the menu.

  • Endpoint 

The API has specific addresses (endpoints) where it can receive requests. 

  • Methods

The request method indicates the operation the client would like to perform on a given resource. Rest APIs are accessible through standard HTTP methods, which perform common actions like retrieving, creating, updating, and deleting data.

  • Response

The server processes your request and sends back a response. This could be the data you wanted, a confirmation that your data was received, or an error message if something went wrong. It’s like the waiter bringing your food to the table.

What Are The Benefits of API?

  1. Automation

APIs can be used to automate time-consuming tasks so that humans can focus on the more important tasks. This helps in improving productivity, especially for developers and testers.

  1. Innovation

Public APIs can be used by external engineering teams, stimulates innovation and speeds up the development by enabling developers to recover existing functionality to create new digital experiences.

  1. Security

APIs can provide an extra layer of protection against unauthorized breaches by requiring authentication and authorization for any request to access sensitive data.

  1. Cost Efficiency

You can easily access the useful third-party tools and infrastructure with APIs. It helps businesses avoid the expenses of building complex in-house systems.



APIs work as the backbone of modern software development. It supports uninterrupted communication and integration between various systems. So, tech startups need to understand the APIs to help them develop innovative products and services in today’s world.