What is a frozen Python module?

Question

The Python help of the module imp is talking about a frozen module. What is it?

http://docs.python.org/library/imp.html#imp.PY_FROZEN

Answer 1

The answer is in the same place:

(Frozen modules are modules written in Python whose compiled byte-code object is incorporated into a custom-built Python interpreter by Python’s freeze utility. See Tools/freeze/ for now.)