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The UID is the userid. In a typical Linux/Unix system, each user has a numerical user id. Even if the user has an actual name. For example, the user root has a UID of 0. In Android, most processes run under their own UID. Here is a list of some of the reserved UIDs and what processes run under them. As you can see from that list, UID 10000 and up are user apps, meaning that they are apps that you've installed (most likely) and won't be system apps (probably). You can use something like Quick System Info to correlate processes to the UIDs that they are running as. When you see a UID in spare parts, it usually means an app running under that UID is holding a lock or using data, or whatever the case may be for the section you are looking under.