Williams Sonoma describes a panini grill as a small counter top appliance that can be used to make panini sandwiches. Panini grills can also be used as small indoor grills for cooking chicken, hamburgers and vegetables. Panini sandwiches are easily recognizable by the striped toasting on the bread.
Panini grills are often made of cast aluminum plates that have a nonstick surface. Some models come with removable panini plates that can be replaced with smooth plates, so the panini grill can be used as a griddle. Other models fold out, making the panini grill into a basic electric grill that can be used in the kitchen.