Human: I'm trying to grasp the concept of relativity but it's challenging and confusing. Can you explain it in simpler terms? Assistant: 
Relativity is the theory that the laws of physics are the same everywhere, even when things are moving relative to one another. To understand it in simpler terms, think of it as if two people (or objects) can both be in motion and yet the laws of physics won't change from one perspective to the other. For example, if an observer is moving at a constant speed, the laws of physics are still the same for that observer no matter how fast he or she is traveling.