The one-paragraph version
An APK is a single install package. An XAPK is a bundle: the base APK plus small config splits (language, screen density) zipped together. Delta Emulator ships as an XAPK so the installer unpacks only what your device needs. Grab it from the download page.
What is inside this XAPK
Three parts: the base APK, an English config split, and a screen-density config split. Total: 52,757,517 bytes, shown as 51 MB. Nothing else hides in the bundle; the manifest lists every piece. The Delta Emulator homepage lists the exact bundle contents for the curious.
The one extra step
Stock Android opens APKs natively but not XAPKs, so you install a free XAPK installer app once. After that, installing is the same tap-and-confirm flow. The install guide walks through it with screenshots of each prompt.
Why developers use XAPK at all
One download serves every device instead of a dozen per-device APKs, and phones skip the splits they do not need. For a 51 MB emulator, the savings are modest, but the single-file distribution is simpler for everyone.
