Android differences between signed and unsigned .apk files?

Question

How many difference between signed and unsigned .apk files in android?

I know only one when i integrate in-app purchase i have unsigned .apk its gives me error Item version is not same as...

and also we cant install unsigned .apk file in android device...

is there any other Diffrences ?

Answer 1

the signed apk will contain an extra folder "META-INF", which contains three files:

1. MANIFEST.MF
2. CERT.SF
3. CERT.RSA

Answer 2

If you send unsigned apk to customer, they have to enable Unknown sources to be able to install the app. Also Google Play Console doesn't accept unsigned one.