I need to work with MSMQ (Microsoft Message Queuing). What is it, what is it for, how does it work? How is it different from web services?
As its name states, it's just a queue manager.
You can Send objects (serialized) to the queue where they will stay until you Receive them. It's normally used to send messages or objects between applications in a decoupled way
It has nothing to do with webservices, they are two different things
Info on MSMQ:
https://msdn.microsoft.com/en-us/library/ms711472(v=vs.85).aspx
Info on WebServices: