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Installation (or setup) of a program (including drivers) is the act and the effect of putting the program in a computer system so that it can be executed. Most programs are supplied in a condensed form intended for sale and distribution. In order to be used, they must be 'unpacked' and the relevant information placed correctly on the computer, taking account of variations between computers, and any customized settings required by the user. During installation, various tests are made of system suitability, and the computer is configured to store the relevant files and any necessary settings required for that program to operate correctly. Because the requisite process varies for each program and each computer, many programs (including operating systems) come with a general-purpose or dedicated installer – a specialized program which automates most of the work required for their installation. Source: http://en.wikipedia.org/wiki/Installation_(computer_programs)
