Hi, there
in This Video I ecplain how you can generate Signed APK for your application in android studio.
You need to create this signed apk because it provide security to your android application so anyone can't read your source code and without this generated singed apk you can't upload your app to the Google playstore.
First you need to create a Keystore where you put your keys and password and then using this keystore you will secure your app from intruders and have other functionality as well.
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