ANR stands for Android Not Responding. it means that your app is getting crashed. You will receive this notification if you are doing some heavy work on the main thread or there is some error in your code.

to know the root cause of ANR you can debug your app or use log statements to figure out the crash. An ANR arrises in order to avoid memory leaks or unnecessary use of resources. you will see a pop up on your phone if the app gets crashed and the app will automatically get closed.