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What is UID on Android?
Is it ID of a particular user or of a particular application?
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pid = process ID. uid = user ID of the application that owns that process. gid = group IDs of the application that owns that process.
A unique device identifier (UDID) is a 40-character string assigned to certain Apple devices including the iPhone, iPad and iPod Touch. A service set identifier (SSID) is a sequence of characters that uniquely names a wireless local area network (WLAN).
Settings. Secure#ANDROID_ID returns the Android ID as an unique for each user 64-bit hex string. It's known to be null sometimes, it's documented as "can change upon factory reset". Use at your own risk, and it can be easily changed on a rooted phone.
Package Manager is a highly powerful application to manage apps, both system and user, installed on an android device.
If you're referring to this UID: Android is based on Linux, so basically it's the same UID you have on a Unix-like OS. When installing an app / package, Android by default[1] creates a UID specifically for that package, so that it can have its private resources / storage space. When no packages are using that UID any more (which could be shared), the UID is deleted.
1. You can override this behavior with android:sharedUserId, but it has some drawbacks.
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This ID is particular to the application
Android assigns a unique user ID (UID) to each Android application and runs it in its own process. Android uses this UID to set up a kernel-level Application Sandbox.
Refer to this doc https://source.android.com/security/app-sandbox
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