This chapter will discuss the tangible aspects of computers – known as hardware. Both visible and encased pieces of hardware will be discussed in this overview of modern PCs.
Hardware is the first level of abstraction, an aspect of computers by which
the complex processes involved in manipulating electricity are hidden beneath
layers of simple interfaces. For example, when typing on a keyboard, users do
not worry about representing the ASCII code for the letter electrically or manually
arranging the circuit for it – the keyboard abstracts (hides) that process.