What killed the dinosaurs?

I'm curious to know, what was the cause of the dinosaurs' extinction? Was it a catastrophic event like a meteor strike or a gradual decline due to changing environmental conditions? Did the dinosaurs face competition from other species that eventually led to their downfall? Or was it a combination of factors that ultimately spelled their doom? We've been searching for answers to this question for decades, and yet, it remains one of the great mysteries of our time. Can you shed some light on what might have killed the dinosaurs?