Join v/s Link : Interview Question

I was just sitting with my colleagues and suddenly one of junior member of our team asked what is the difference between a Join and Link? He was new to Siebel and started learning it, so I thought to make him understand my way. Here is what my view point says :

Anybody came from database background knows, "Cardinality" between two tables can be of four types :
a) One to One
b) One to Many
c) Many to One
d) Many to Many

So, a very simple way to define a Join in Siebel is, "When you have "One" on the right side of the cardinality, there you need to implement Join". Similarly, "When you have "Many" on the right side of the cardinality, there you need to implement Link". That means, "One to One" and "Many to One" corresponds to the Join, while "One to Many" and "Many to Many" corresponds to the Link.

Secondly, a Join exist between a Business Component & a table while Link always exists between two different business Components.

Thirdly, via Join system fetches a single record while Link fetches multiple records.

Fourthly, while implementing Join, we can use the "Join Constraint" to specify the condition on the child entity. In link, we can specify the condition on child entity by putting "Search Specifications".

Note : For "Many to Many" link, we need to make use of Inter table which stores the unique Id of Parent and Child Business Component.