The word "Program" has several meanings, depending on the context. In general, a program is a plan or schedule of activities, procedures, or events. For example, a school might have a program for teaching students about the environment. A government might have a program for providing healthcare to its citizens. A company might have a program for developing new products.
In computer science, a program is a set of instructions that tells a computer what to do. Programs are written in programming languages, which are human-readable languages that are translated into machine code by compilers or interpreters.