Computer is a term used to describe a wide range of electronic devices that are capable of performing calculations and other operations. The most common types of computers are laptops, notebooks, and ANALOG computers. Laptops are small, portable computers that are designed to be used on the go. Notebooks are similar to laptops but are usually smaller and more lightweight. ANALOG computers are computers that use continuous physical phenomena such as electrical, mechanical, or hydraulic quantities to model the problem being solved.