Fan trap and chasm trap - Database

Question

Can anyone tell me what is chasm trap? Perhaps fan trap too as I\'m not too clear. Also, please provide easy to understand examples (via Chen notations).

My understa

Answer 1

I fan trap occurs when three tables joins in a fashion where there realtion to each other is 1 to many way. means table A B and C are in join as .. table A links to table B in one to many and table B to table C relates again one to main way A-->B-->C.