Android Studio is an integrated development environment that allows people to develop mobile applications. It has four major tabs: Project, Build, Code, and Tools.
Project - This is where you will do all the coding for your application.
Build - This is where you test your application for errors and run builds of your app.
Code - This tab will let you edit source code from any project in Android Studio. You can also download libraries or even create a new project from this tab.
Tools - This tab will help you understand the differences in Android versions and what tools are available to help you with building your app and troubleshooting problems with it.