A computer program is a list of instructions that tell a computer what to do. Everything a computer does is done by the instructions of a program. The first computers were made with only one built-in program, but today's computers have memory, which can be used to store many different programs. John von Neumann, a mathematician born in Hungary, came up with this idea in the late 1940s.

Some common examples of computer programs:

• Web browsers, like Mozilla Firefox or Chrome
• Word processors, like Microsoft Word or Google Docs
• Video games
• Operating systems, like Microsoft Windows or iOS