What is "AIRAC Cycle" and how do I need to choose one for Flightplanning

And how does it affect my FlightPlan

AIRAC cycles updated monthly. If you have an old one, SIDS/STARS will look different than a newer one. Sometimes they change, sometimes they don’t. I recommend using the most recent ones.

I neither understand yours nor @CptNathanHope , Can I have one in a simple english?

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