It's where you sew on to layers of fabric then cut the top layer away to show what's underneath.
I made this spangly fishy picture with reverse applique!
You will need:
Card, two A6 pieces
Lots of ribbon or strips of fabric
Sequins on a string
Needle and thread or a sewing machine
A6 piece of fabric, mine's spotty and blue.
Follow the easy to follow photos to make your very own picture. :D