Channels are cut or etched into the silicon, which make a circuit, a kind of pathway along which the electric currents flow. For the chips to carry out different kinds of tasks, different patterns are etched into the silicon. The flake of silicon is sealed inside a plastic case for safety purposes. Metal tags are attached on the outside of the case for easy connections to parts and circuits. A silicone chip is so tiny that they can even pass through the eye of a needle.
Chips can do a lot many things.
They enable you to play computer games, they can be programmed to record a television programme days ahead or to cook a meal in an oven. Chips are everywhere, in your washing machines, sewing machines, digital alarm clock, telephone, electronic keyboard, a typewriter and do on. A computerized cash machine outside the bank gives you money in seconds. You put your bankcard into a slot and type your code number on the keyboard. You key in the amount of money you need and 'lo behold' the notes come out.