Software is a program that enables a computer to perform a specific task, as opposed to the physical components of the system (hardware). This includes application software such as a word processor, which enables a user to perform a task, and system software such as an operating system, which enables other software to run properly, by interfacing with hardware and with other software. Software also acts as an interface between the hardware like processor(s) and user(s).
Gates is a leading philanthropist, and has stated that he intends to give away the majority of his vast wealth. He and his wife set up the Bill & Melinda Gates Foundation (B&MGF) in 1994 with the aim of improving health and combating poverty in developing regions across the world. He has attracted considerable acclaim for the Foundation's work, including its work in combating HIV infection in Africa.
Gates finally quit day-to-day responsibility at Microsoft in June 2008 in favour of running the B&MGF after a long period of moving away from executive control, originally as CEO, then as 'Chief Software Architect'. Gates remains chairman of Microsoft.
This existing base of FLOSS software represents a lower bound of about 131,000 real person-years of effort that has been devoted exclusively by programmers. As this is mostly by individuals not directly paid for development, it represents a significant gap in national accounts of productivity. Annualised and adjusted for growth this represents at least 800 million euros in voluntary contribution from programmers alone each year, of which nearly half are based in Europe.