Panini is an Italian word meaning a sandwich made with Italian bread. What makes it different is that it is not sliced but cut horizontally in half and filled or topped with a variety of ingredients and then usually toasted. The best breads to use are focaccia, ciabatta and baguettes as they are better for toasting or grilling.
I always enjoy making and eating a Tomato and Cheese Panini. Ingredients are so readily available and you always feel fulfilled after consumption. And a panini is a cheap meal when you are on a budget.