What exactly is "binding"?

[exarkuun1991]

Etymology and definition. Normal definition is a connection of sorts..just curious.
Also, is there a binding spell that doesn't require a poppit? I don't have such a method.
Let's just say, "binding" was used as a way to define someone obeying another person's(mine, it was hypothetical scenario) will, so they could be commanded..a thrall. This seems inaccurate on many levels, however, it came from what I can almost verify was really a demon..years ago..a nice fellow, really, but maybe I misheard.