There are two main design philosophies behind software development, closed-source, and open-source.
Tip: Source code is the code that the program is written in.
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What is closed-source?
In closed-source software the source code of the software proprietary and private.
This licence will include restrictions on things such as editing the software.
Open-source software is generally but not always free.
If the source code is closed, no-one else can use it to easily copy your software.
There are plenty of instances of decades-old bugs being found in open software, that no-one had noticed before.
Neither open- nor closed-source is necessarily a better design philosophy than the other.
They both have advantages and disadvantages and are useful as competition between each other.
