Difference between program and software product:
Programs are developed by individuals for their personal use. They are therefore, small in size and have limited functionality but software products are extremely large. In case of a program, the programmer himself is the sole user but on the other hand,
in case of a software product, most users are not involved with the development. In case of a program, a single developer is involved but in case of a software product, a large number of developers are involved.
For a program, the user interface may not be very important, because the programmer is the sole user. On the other hand, for a software product, user interface must be carefully designed and implemented because developers of that product and users of that product are totally different.
In case of a program, very little documentation is expected, but a software product must be well documented.
A program can be developed according to the programmer’s individual style of development, but a software product must be developed using the accepted software engineering principles.
Program vs. software product | software engineering