What is it called when you say something over and over again?

I'm curious, could you tell me what it's called when someone repeats the same thing multiple times? Is there a specific term for this behavior? I'm looking to better understand the nuances of communication and how repetition can play a role in conveying messages. I'm particularly interested in this concept in the context of cryptocurrency and finance, as I often encounter similar patterns in market analysis and investor sentiment. Your insight would be greatly appreciated.