Chromebooks are already very capable computers, but Google is trying to make its Chrome OS even more powerful by adding the Android app support. This allows users to install pretty much any app from the Play Store and get better and more complete experience.
Unfortunately, the Android app support is not yet available for all Chromebooks, but Google is adding new devices to the list almost every week. Today, list of 31 devices has been expanded with 17 new Chromebooks. The complete list of supported Chromebook devices is available here.