operational excellence

This week we focus on some additional terms for IT users.  This week lets discuss what a community of practice is.   Why are they important and how can they impact the culture within an organization?
Note: The first post should be made by Wednesday 11:59 p.m., EST. I am looking for active engagement in the discussion.  Please engage early and often.
Your response should be 250-300 words.  Respond to two postings provided by your classmates.