The document discusses different types of computers categorized by their processing power and common uses. Supercomputers are the most powerful and used by large organizations for intensive tasks. Mainframe computers have high-speed processing and storage and are commonly used by banks and insurance companies. Mid-range computers are for medium-sized businesses and specific applications. Microcomputers or desktop computers are the most widely used type, including desktop and notebook/laptop computers used in homes and most businesses. Handheld computers are the smallest, palm-sized devices including early palm-top computers and current personal digital assistants (PDAs).