People call a lot of things, computers. Some of them are cheap, but can only process numerical information. Such devices would better be described as 'calculators' rather than computers. Historically speaking the word computer has been derived from the Latin word 'computere', which means to calculate. Therefore, the term computer can logically be applied to any calculating device. However, in technical parlance, the term has come to refer specifically an electronic computer. In other words, it may be stated that the 'computer' uses electronic devices such as transistors, resistors, diodes based on two measurable states (i.e., 'on' and 'off).