Time is one of the most important and mysterious concepts for mankind. It plays an important role in the lives of each of us, it is widely used in many scientific fields, especially in physics and philosophy, but there are many questions about its true nature. This article discusses the perception of time in physical theories and its basic concepts, and compares the concepts of time in classical mechanics, relativity theory, and quantum mechanics. Specific characteristics of time in each theory and its influence on physical processes are considered. It also discusses the nature of time, its disappearance, and theoretical disagreements. The study brings together the philosophical and scientific aspects of the concept of time, offering a new perspective for those interested in learning.