Install and Uninstall Android app from ADB

To Install:

To install the apk from command line(after it is built successfully),

adb install -t app.apk

Don't forget to give the full path to the apk.

To Uninstall:

In short, to uninstall apk from command line type:

adb uninstall package_name

To be more precise:
Find the exact package name by typing:

adb shell su 0 pm list packages

From the list, find the name of the package of your app (Say it is com.sulav.app.us.debug)

Now type:

adb uninstall com.sulav.app.us.debug

The app is now uninstalled from the emulator

You can also find the package name by:
Go to Device File Explorer in Android Studio -> data -> data -> Now scroll till you find the name of the package.