An integrated development environment (IDE) is a software application that provides comprehensive facilities to computer programmers for software development. An IDE normally consists of at least a source code editor, build automation tools, and a debugger. Some IDEs contain the necessary compiler, interpreter, or both, and others do not.(Source)

IDEs are very important for programmers, because they can help your code to be cleaner , reduce time needed to type it, and most of them contain option of debugging which is extremely helpful when it comes to programming.

The most famous IDEs are:Visual studio, NetBeans, IntelliJ idea, Eclipse, Notepad++ etc.