Multiplicity vs Cardinality

The simplest explanation would be to say:

Multiplicity = Cardinality + Participation

Cardinality: Denotes the maximum number of possible relationship
occurrences in which a certain entity can participate in (in simple terms: at most).

Participation: Denotes if all or only some entity occurrences participate in a relationship (in simple terms: at least).

Ex: enter image description here

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