Wikipedia
Aptoide is a distributed marketplace for mobile applications which runs on the Android operating system. In Aptoide, unlike the default Google Play Store, there is not a unique and centralized store but each user manages their own store.
The Android application used to access the stores is open source, and there are several forks such as F-Droid The communication between the client and servers is done using an open protocol based on XML.
The concept is inspired by the APT packaging manager, which can work with multiple sources (repositories). When the user wants a package, they use the client to search for sources where the application is stored.
The name Aptoide is formed from the words "APT" (the Debian package manager) and "oide" (the last syllable of "Android").