Minimum Cardinality and Maximum Cardinality in Database

Good afternoon!

I'm trying to understand about Cardinalidade Minima and Cardinalidade Máxima between different entities!

What I know so far is:

  

A Cardinalidade Minima can be a Atributo Opcional(0) or a Atributo Obrigatório(1)

     

A Cardinalidade Máxima can be a Atributo Monovalorado(1) or Atributo Multivalorado(N)

My question is, how will I determine the attribute's cardinality?

Will it be from the relations between the two attributes (for example A and B) for both cardinalities?

Or at minimum cardinality I have to see if the attribute is mandatory or not, and at the maximum I have to see how many attributes of A relate to how many attributes of B and how many attributes of B relate to the attributes of A? / p>