Six degrees of separation is the theory or we can say concept says anyone in this world can be connected to any person in this world through a chain of acquaintances that has no more than five intermediaries.
this is what I know about "Six degree of separation"
The answer is not a list of six things (like the 5 stages of depression.)
instead, it's the concept that between any two people, there is a path of at most six other people connecting them. The relationship may be tenuous to the sixth, and there are certainly isolated groups and individuals to whom it doesn't apply.
For further illustration, Google "six degrees of kevin bacon"