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What is time? Some people think that time is the most basic physical quantity. Some people think that time is created by people's intentions. Some people think that time can be changed. (The theory of relativity believes that the time of objects moving at high speed can be slowed down. ). So what is time, and why does the time of the frame of reference of high-speed motion slow down! What exactly is time, here is an attempt to understand and explain these essential issues ofdoi:10.6084/m9.figshare.12593351.v1 fatcat:lxwg75ngnjhinix2y6s4dxgyyi