Watch the Carter Style online guitar lesson by TrueFire from Play Country Guitar 7: Style Variations
Carter Style - Concept 2 is a video guitar lesson presented by Roberto Dalla Vecchia and is sourced from Solo Flatpicking Handbook.
The "Carter Style" consists in playing a simple melody on the lower guitar strings while strumming the higher strings to fill up holes in between melody notes. This technique will allow you to play melody and back up at the same time, all by yourself.
This style was named after Maybelle Carter from Carter Family, a folk band really popular in the States back in the 30's. The most important element when playing in this style is to strum your chords very lightly, always making sure the melody stands out.