What is API? Easily explained

In connection with programming, the term API appears again and again. We explain to you in simple words what it is and what you need it for.

What is API?

API is short for "Application Programming Interface". So an API is an interface: It connects software and hardware components, such as applications, hard disks or user interfaces.

• When programming, APIs standardize the data transfer between program parts, such as modules, and programs.
• Complex programs can no longer do without APIs. Individual program parts, so-called modules, are encapsulated from the actual code. The modules then only communicate via the API.
• Simply put, APIs translate the software into machine language, making it readable for various components.

Why do you need APIs?

• Thanks to program modules and the associated APIs, complex programs are easier to maintain. An API uses the data passed to test whether the module is working properly. This makes it easier to locate and correct errors.
• In addition, APIs act as data transmitters in the software area: content can be exchanged between different websites and programs using APIs.

The IT area is full of terms that are not self-explanatory. We have therefore written various practical tips that deal with this matter. For example, read what exactly software engineering means.