Objective-collapse theory is a way of understanding how the universe works. It suggests that the universe is like a game of chance and that there is something special that all particles have inside them, called 'objectives'. Whenever these objectives interact in a very special way, they cause all other particles around them to collapse in an instant, following a pattern like flipping a coin. This process, which happens extremely quickly and randomly, is known as 'objective collapse'. It is believed that this is happening all the time, and that the universe is constantly changing and growing due to the randomness of objective collapse.