An Arpeggio, is simply a chord where the notes are each played separately.
The word 'arpeggio' is Italian, as are many of the terms used in music, and means 'harp like', or in the style of a harp.
As always, it is easier for me to demonstrate arpeggio playing, with a video
Here is the music I will be playing in the video example.
It uses three of the chords that you already know : C major, G7, and F major.
The same fingering is used as in the chords in the previous lessons.