Easy explanation (i think)
So imagine if there was a giant clock on the earth, no matter how long away you are from it, you can always see it.
Now imagine that you are in a spaceship that is traveling at near light speed or light speed moving away from the earth, the clock doesn’t change no matter for how long or far you go away from it (if you are traveling at light speed) but time passed for you, but not for everyone on earth. So when you stop, the clock continues again and time has moved for you, but not for the people on earth, lets say you had a wristwatch and 10 minutes has passed on the watch, but not on the clock on earth, so time has “passed” 10 minutes for you, but 0 seconds on earth
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