I was struggling to put multiple tokens together in a macro and paste them as a single token in the result. That’s when I stumbled on this link, it said, in very plain english:
The token pasting (##) operator simply eliminates any white space around it and concatenates (joins together) the non-whitespace characters together.
In the very beginning it mentions that this is the least understood operator. Right it was. Just by looking at the above definition, I got my job done. 🙂