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The document discusses memory and processors. It describes different types of memory like RAM, ROM, and flash memory and explains how they work. It also explains what processors are and how. A microprocessor is a type of integrated circuit on a single chip that contains the functions of a CPU. Key point: All CPUs are microprocessors, but not all microprocessors are called CPUs. Memory is used to store instructions so that the processor can quickly fetch, decode and execute them. This is how you should understand the difference between secondary storage, RAM, and the. Notes for IGCSE Information Technology (4IT1). Information Technology study notes for GCSE level (General) designed for student revision and practice