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What's “Offline” in SDLC and when/why do we use test automation?

I was asked these questions during a job interview question. I totally stumbled on # 1 and for # 2 even though I answered but not a very convincing way. I would appreciate a concise and well phrased asnwers:

**1) During SDLC, when would you be asked to take it "offline"

2) Throughout SDLC process, where would you implement test automation and why?**