Which software program did Paul Allen and Bill Gates develop for the Altair 8800?

Paul Allen and Bill Gates developed BASIC for the Altair 8800, a pioneering personal computer released by MITS in 1975. BASIC, which stands for Beginner's All-purpose Symbolic Instruction Code, was a programming language designed to make computing more accessible to individuals who were new to programming. This was significant because it provided a way for users to write and run programs on the Altair 8800, harnessing its capabilities effectively.

The success of BASIC with the Altair 8800 marked the beginning of Microsoft, as it was one of the company's first products and laid the foundation for their future success in the software industry. The development of BASIC reflected the growing demand for user-friendly programming languages at a time when computers were primarily used by engineers and scientists who were comfortable with complex coding languages.