This question always fascinates physicists and curious minds like us.On a very basic level, time is something we measure through a gadget called Clock. Among physicists, there is no real doubt that time does really, truly exist. It’s a measurable, observable phenomenon. Physicists are just divided a bit on what causes this existence, and what it means to say that it exists. Indeed, this question borders the realm of metaphysics and ontology (the philosophy of existence) as much as it does on the strictly empirical questions about time that physics is well-equipped to address