Difference: Sequence Diagrams, Collaboration Diagrams.

Please refer to the following URL to know the differences between Sequence Diagram and Collaboration Diagram, http://onlydifferencefaqs.blogspot.in/2012/08/uml-difference-faqs-1.html

Both diagram represents how the objects interacts with each other. However, the difference is sequence diagram focus on the sequence of the interaction whereas the collaboration diagram focus only on the object interaction only