My current company is using Scrum to develop softwares. To me, it is a set of practices and tools which enhances communication, collaboration, trusts, etc between members of a team.
What people are still debating is that, which one, Scrum or Lean is better. I said, why not both? To me, the term Agile has been broaderned to bear many meanings. It points to a lot of processes. But under the hood. It is still 4 statements and 12 principles of Agile Manifesto. Everything else is just a technique. We can decompose Scrum or Lean into techniques and combines several ones to form a new method. To see if it works, we have to try it. But in the end, they are just tools.