A Pumpkin is a large, orange, vegetable. In the USA, pumpkins are traditionally associated with Halloween and Thanksgiving and made into pumpkin pie. In other parts of the world, such as Australia, they are eaten year-round, usually as a savoury dish. It is similar in taste to sweet potato.
There are many different varieties of pumpkin, and they have slightly different flavours, but the major differences are in the skin colour and the thickness of their rind. Some varieties have a very thin rind which is easy to cut and actually becomes edible when you cook the pumpkin, but as a whole the rind is discarded. Most varieties of pumpkin are at least technically edible. As a rule of thumb, the larger the pumpkin, the tougher the skin and the woodier and more tasteless the flesh.