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is a command-line tool provided by Google as part of the Android Build Tools. It stands for "Desugar" and "D8." Its primary function is to compile Java bytecode ( .class files) into the DEX format ( .dex files) that the Android Runtime (ART) can execute. It effectively replaces the older dx tool and is the underlying compiler for the Android Gradle Plugin.

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The "d8.jar" file is a Java archive file that contains the Dalvik converter, which is a part of the Android build process. Specifically, it's related to the D8 (Dex) converter, which is used to convert compiled Java bytecode into Dalvik bytecode that can run on Android devices. is a command-line tool provided by Google as