Open source refers to a program in which source code is available to public for use & modification. The software whose source code is available for modification by anyone is called open source software.
What is open source software?
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Open source software is software with source code that anyone can inspect, modify, and enhance.
"Source code" is the part of software that most computer users don't ever see; it's the code computer programmers can manipulate to change how a piece of software—a "program" or "application"—works. Programmers who have access to a computer program's source code can improve that program by adding features to it or fixing parts that don't always work correctly.
Hereis the example of Open source