An API, or Application Programming Interface, is a set of defined rules that enable different applications to communicate with each other. APIs are mechanisms that allow two software components to communicate with each other using a set of definitions and protocols. An API acts as an intermediary layer that processes data and helps businesses connect the many different applications they use in day-to-day operations, which saves employees time and breaks down silos that hinder collaboration and innovation.

APIs are used to integrate new applications with existing software systems, which increases development speed because each functionality doesn’t have to be written from scratch. APIs can be used to leverage existing code. APIs are all around us, and every time we use a rideshare app, send a mobile payment, or change the thermostat temperature from our phone, we’re using an API.

APIs adhere to specific standards, typically HTTP and REST, which enable them to be developer-friendly, self-described, easily accessible, and understood broadly. Modern APIs are treated more like products than code. They are designed for consumption for specific audiences, and they are documented and versioned in a way that enables users to have clear expectations of their maintenance and lifecycle.

APIs simplify design and development of new applications and services, and integration and management of existing ones. They offer significant benefits to developers and organizations at large, including:

• Innovation: APIs present a unique opportunity for businesses to meet their clients’ needs across different platforms. For example, maps API allows map information integration via websites, Android, iOS, etc. Any business can give similar access to their internal databases by using free or paid APIs.

• Expansion: APIs allow businesses to expand their reach by providing access to their resources while maintaining security and control.

• Ease of maintenance: APIs act as a gateway between two applications, making it easier to maintain and update them.

In summary, APIs are a set of defined rules that enable different applications to communicate with each other. They are used to integrate new applications with existing software systems, simplify design and development of new applications and services, and integration and management of existing ones. APIs adhere to specific standards, typically HTTP and REST, and are treated more like products than code. They offer significant benefits to developers and organizations at large, including innovation, expansion, and ease of maintenance.