The Bootstrap Paradox challenges how something from the future placed in the past can exist, a popular theme in time travel stories.
The Bootstrap Paradox : When the Future Creates the Past

Imagine traveling back in time and leaving behind a book that contains the secrets to building a time machine. Your younger self finds the book, inspired by its contents, dedicates their life to science, and eventually invents the very machine that allowed you to travel back in time in the first place. But where did the book originally come from? In this mind-bending scenario, we encounter the bootstrap paradox, a thought experiment that explores the perplexing consequences of closed causal loops in time travel.
Time for some definition

An object, idea, or thought if traveled back to the past from the future, without having a true origin and gets stuck on an endless cycle, it is referred to as Bootstrap Paradox.
Timey-Wimey Loops: Understanding the Paradox




