IDE stands for Integrated Development Environment. An IDE contains all the tools you need for programming, in one program.
The Integrated Development Environment, abbreviated IDE, combines the most important tools for creating software in one program. An IDE includes, for example, a text editor/editor, compiler and linker, debugger, interpreter, tools for creating graphical interfaces, version management and other tools.
IDLE for Python
Some IDEs only support a single language, for example IDLE, which is an IDE that is bundled with the language Python.
Xcode from Apple
Programming an iOS App with Xcode
If you are planning on programming an iOS App, you will need to install and use Xcode as IDE. The programming language for iOS Apps is Swift.
Android Studio from Google
Android Studio is the official development environment for Android software development. It is a free open source IDE.
Programming an Android App with Android Studio
If you are planning on programming an Android App, Android Studio is the IDE you are looking for.
Visual Studio Code from Microsoft
Atom from GitHub
Visual Studio Code (from Microsoft) or Atom (from GitHub), which are one of the most popular text editors, are also IDEs.
If you are looking for a text editor to write HTML and CSS, which are no programming languages (I bet you heard that a million times), I highly recommend Visual Studio Code from Microsoft or Atom from GitHub. Both editors are the most popular ones. I prefer using Visual Studio Code, because Visual Studio Code offers a lot of extensions.