Is cat grass different from regular grass?

I bought this cat grass to grow for my cat. It looks just like regular grass. Is there actually a difference?

Answer:

Cat grass is different from normal grass, Avena Sativa is the name its less well known as.
It is ideal for cats because it is easier for your cat to digest, normal grass will stick to your cats tongue making it harder to digest.
Cats usually eat grass to help their digestive system, so if there isn't cat grass around they will eat anything, including plants that could be harmful or poisonous to them.