Can anyone explain to me the Raspberry Pi? I am having trouble understanding what it is.
Take a look at the Raspberry Pi FAQs:
What’s a Raspberry Pi?
The Raspberry Pi is a credit-card sized computer that plugs into your TV and a keyboard. It’s a capable little PC which can be used for many of the things that your desktop PC does, like spreadsheets, word-processing and games. It also plays high-definition video. We want to see it being used by kids all over the world to learn programming.
The RPi is a computer learning and exploration kit aimed at kids, but very popular with techies too. It is a bare board ARM based computer that is a little bigger than most smart phones, plugs into a Micro USB Phone charger for power and a TV (analog RCA or HDMI) as a monitor. It has GPIO pins to experiment with computer/realworld interactions (such as lighting LEDs for status indicators, driving motors, monitoring button presses on custom buttons....
It is designed to be the brains to a modern electronics experiment kit, and as a cheap platform for teaching computer programming.