So what is rubber duck debugging?

Rubberduck debugging is a broad term for a method that involves an object or imaginative entity to explain the things you are doing to.
For most people it's a lot easier to explain their code to an inanimate object like a rubberduck for instance on order to see their code and / or abstract logic through a different lens.

Most of the time the mistake / bug can be found while trying to explain your own code or trying to make someone / something else understand it.

Thus people began using mostly rubberducks to teach them their code in order to see their own mistakes.

So that's what Rubberduck debugging is.

@R5on11c let's analyse your comment.

Paragraph 1: I accept that all we are trying to get is to get a different perspective and I think I kind of said the same. And it doesn't have to be "inanimate object". Even a person with no programming knowledge will suffice. The whole point is teaching what you did to someone/something.

Paragraph 2 and 3: I already said that.

Anyways thanks for the effort in putting the words in a different way.