The alphanumeric string “youtube 20.12.46 apk” represents a specific version of the YouTube application packaged in the Android Package Kit (APK) format. The “20.12.46” portion signifies the version number assigned to that build of the application. This file format is used for distributing and installing mobile apps on Android operating systems. An example would be downloading and sideloading this file onto an Android device to install or update the YouTube application.
This particular file can be important to users who seek a specific feature set, a particular interface design, or compatibility with older devices not supported by the latest application versions. Historically, users have sought older application versions to circumvent changes they disliked or to bypass regional restrictions. They can also be important for reverse engineering, bug-fixing, or testing on specific devices, and allow for access on older, outdated devices.