This document provides an introduction to microprocessors and their applications. It defines a microprocessor as a multipurpose, programmable VLSI chip that accepts digital data as input, processes it according to stored instructions, and provides results as output. The document discusses the main components and units of a microprocessor including the ALU, registers, and control unit. It also outlines some of the key applications of microprocessors such as in mobile phones, digital cameras, traffic lights, cars, aircraft and more. Finally, it lists some of the latest microprocessor models from Intel including the Core i7 and Core i5 series.