Thanks for your help. I think many things are clear now, below is summary of my understanding. Please help if its wrong somewhere.
Parent entity- From which the primary key migrates. Child entity- To which the primary key migrates and becomes a foreign key.
Dependent entities- Which do not have their own primary keys and rely on the keys of the independent entities they are related to.
Dependant entities also called 'Weak entities' and 'ID dependant entities'
If an independent entity is a child entity, it has its own primary key and the imported foreign key is not the primary key.
In 1:M relationship, is it true that the entity occuring once is always the Independant entity?
In a case where one is dependant and one is independant, is it ever possible that the dependant can be the Parent?