There are two main categories of people who are interested in program documentation. They are ; Programmers, UsersUsers , System EngineersCustomers, ProgrammersSystem Engineers, Users

The two main categories of people who are interested in program documentation are:

1. Programmers: They are the ones who write and maintain the code. They need documentation to understand the purpose of the program, how it works, and how to use it. This includes both internal documentation (comments in the code, function and variable names, etc.) and external documentation (user manuals, API documentation, etc.).

2. Users: These are the people who use the program. They need documentation to understand how to install, configure, and use the program. This is typically provided in the form of user manuals, online help, and tutorials.