Module names with and without a "u"

[BigMan]

In the Micropython documentation, I find very often similar modules which seems to have only a different names. E.g. there is a module utime and time. What is the story behind that?

[deshipu]

The modules that start with "u" are simplified implementations specific to MicroPython, often not implementing the full library, as defined by Python. They will often have an alias with a name without the "u". This is done so that users can substitute a more complete implementation if needed.