The document provides information on building a smart mirror using a Raspberry Pi. It discusses that the Raspberry Pi is a small, inexpensive computer that can be used for tasks like word processing and playing videos. It notes that over 3 million Raspberry Pi units have been sold. It then covers the hardware components of the Raspberry Pi, operating systems that can be used, and provides step-by-step instructions for setting up a Raspberry Pi to power a smart mirror, including downloading required software, configuring settings, and rotating the display.