ADT stands for Android Development Tool. It is used to develop the applications and test the applications.
As of my last knowledge update in January 2022, ADT (Android Developer Tools) was a set of plugins for the Eclipse IDE (Integrated Development Environment) that provided tools for developing Android applications. It included a graphical user interface (GUI) designer, tools for managing Android Virtual Devices (AVDs), and other features to streamline Android app development.
However, it’s important to note that the Android development ecosystem evolves rapidly, and changes may have occurred since my last update. Google announced the deprecation of Eclipse ADT in favor of Android Studio, which became the official IDE for Android development. Android Studio is based on IntelliJ IDEA and has since become the standard for Android app development.
As of 2024, it’s highly likely that developers are using Android Studio for Android app development. If there have been any further changes or developments in the Android development tools, it would be advisable to check the official Android developer documentation or other reliable sources for the most up-to-date information.