"Quantum resistant" refers to a technology or encryption method that is designed to be secure against attacks by quantum computers. Quantum computers are powerful machines that can potentially break current encryption algorithms, making them obsolete and vulnerable to hackers.

For example, let's imagine a message is being sent from one person to another using traditional encryption. Currently, this encryption is considered secure because it would take a regular computer a very long time to decipher the message. However, if a powerful quantum computer is developed in the future, it could crack this encryption much faster.

Now, imagine the same message being sent using a quantum resistant encryption method. Even if a quantum computer is used by a hacker to try and decrypt the message, the encryption is designed in such a way that it remains secure. This means that the message would stay protected and confidential, even against powerful quantum computers.

With Quantum-resistant cryptography, Bitcoin remains safe and secure, even if large-scale fault-tolerant quantum computers are built.