Computer systems are now commonplace in every part of our daily life. This first chapter introduces the basic components that make up these computer systems; most of which will be described in much greater depth in later episodes. Basic components, including hardware (both external and internal) and software (both applications and systems), are all briefly introduced in the following sections. Comparing books with computers is a good analogy: the actual pages and the ink used on the pages are equivalent to the hardware used to make up computers; the words written on these pages are equivalent to the software. Without the words, the book is useless. Similarly, computers would be useless to any of us without software.

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