I always see people mention that "Python binding" and "C Sharp binding" etc. when I am actually using their C++ libraries. What does binding mean? If the library is written in C, and does Python binding means that they use SWIG kind of tool to mock a Python interface?
Newbie in this field, and any suggestion will be welcomed.
In short, yes. A binding is just that, an interface to a library or program written in another language, though it need not be generated using SWIG.
SWIG is just a tool for automatic generation of the same...
When someone talks about something like a "C# binding" of a library, they are indicating that you and API is being provided in C# for a library written in a different language. This may or may not involve an autogeneration tool like SWIG.
You're right, for a general library, a "binding" essentially means "easily callable from". The binding may or may not have been created with SWIG, that's just one way to do it.
If the library is written in C, and does Python binding means that they use SWIG kind of tool to mock a Python interface?
Yes, you are right. That will be called a Python binding of the respective library.