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TL431-Q1: Query on application

Part Number: TL431-Q1
Other Parts Discussed in Thread: TL431,


I could see 10nF Cap between cathode and reference pin in data sheet of TL431(for ex: Image attached). Two questions as follows:
1)  Is it mandatory to have this cap for voltage regulator application?
2) i know vaguely that it is for stability. What is its use exactly?