What are three dots in this DFA?

Question

I need to understand this DFA? I have failed to understand it, especially three dots in the diagram. I am getting a vague idea of why is a transition pointing to where it is pointing. But I am still very confused. So it will be great if somebody can tell what these dots mean:

1. When they appear on the name of a transition, like 1? 2. When they appear between two states which are not connected?

Answer 1

its simply mean there are many others instead of only this transition.you can see after q001 , q101 comes.and horizontal dots shows q00 , q01, q10 , q11 also connects with them which are not written here.