Can you explain what strong associations between objects in a system mean?

Strong references between objects in a system mean that one object directly holds a reference to another, preventing it from being garbage collected. As long as there is at least one strong reference to an object, it will not be removed from memory.

In C#, this is the default type of reference used. For example, if object A contains a field referencing object B, then B will not be destroyed as long as A exists and references it.

It is important to consider this to avoid memory leaks, such as when creating cyclic references where objects refer to each other but are no longer used by the program.