how to explain "What is Spring in brief?" in 30 to 50 seconds?

[adam Lui]

I am preparing for an upcoming possible interview.

At a junior level, how should i explain this question?

personally i am quite confused how to give a definition of it as well.

[Joachim Rohde]

What about the wikipedia explanation of the key features?
http://en.wikipedia.org/wiki/Spring_Framework#Key_features

[Nick Williamson]

your best bet is to read through it on Spring's website then you may even be able to come up with an answer that you know, not one you memorized... it's ok because if they ask you in an interview it's probably going to be something you'll need on the job.