Watch the Intro to Arpeggios online guitar lesson by TrueFire from Play Jazz Guitar 3: Tools & Techniques
Arpeggios are just the notes of a chord played one at a time, instead of played all together in a strum. So you can technically take any chord and play the notes one at a time and you have an arpeggio. However, sometimes you might want to find a more interesting place to play those notes, or a spot where they fall better under your fingers. Dig into these arpeggio shapes and practice them slowly.