What is total and partial participation ?

Total participation-every entity in “the total set ” of entityies must be related to other entities via relationship.
Ex-Employee WORKS-FOR Department.
Here it means that every employee works for a particular department.
Partial participation-some or the part of part of the set of entities are related to other entities via a relationship .
Ex-Employee MANAGES Department.
Here it does not mean that every employee manages a department.