Jack's teacher is Ms. Smith.
She is teaching the class the alphabet.
Jack already knows the whole alphabet.
He learned the alphabet from his parents.
Jack's mother and father are also teachers.
They taught Jack many things before he started school.

Your computer has no idea what a "mother" or "father" is,
or how they are related to their various offspring.
OWL allows you to make connections between terms,
through a structure of classes and associated properties.
Connecting "Jack" to "Mother" and "Father" through OWL terms-
means your computer can answer when you ask after Jack's parents.