The Android Support Library is not actually a single library, but rather a collection of libraries that can roughly be divided into two groups: compatibility and component libraries. For details, please see Understanding the Android Support Library.

support newer Android features on older Android versions.

a static library that you can add to your Android application in order to use APIs that are either not available for older platform versions or utility APIs that aren't a part of the framework APIs.

an open-source implementation of a TNEF message handler, which can be used as a command-line utility or integrated into Java-based mail applications to extract the original message content.

an open-source implementation of a TNEF message handler, which can be used as a command-line utility or integrated into Java-based mail applications to extract the original message content.

an open-source implementation of a TNEF message handler, which can be used as a command-line utility or integrated into Java-based mail applications to extract the original message content.