The source code is the main component of computer programs that was made by professional programmers. This can be easily read and understood. For example, the programmer will use the windows notepad and type in a sequence of the letter C then saves it as a text file, then the file will state that it has a source code. Check out
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There are software vendors that do not offer their source codes because they want to prevent any changes that can be done to their software licenses that can modify source codes and to protect their intellectual property. This is the proprietary source code. Read more about
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The open source codes are available to be accessed by anyone since the different developers had improve the software so it is much more secure and robust. Anyone can freely take open source codes. There are some developers that use source codes to make similar software programs for operating platforms. This task is easy to accomplish if there is coding instructions. Data communication protocol is used for making and controlling networks and automation. The data communication protocol is considered as an open source code. If it is part of the open source code then anyone can share it and use it. Programmers that have access to source codes can be part of the community by sharing some codes for them to learn the process.