Time travel is the concept of moving between different points in time, similar to how we move through space. It is often depicted in science fiction stories, where characters use devices like a time machine to visit the past or the future. The idea raises questions about the nature of time and whether it is possible to change historical events. In physics, time travel is explored through theories like Einstein's theory of relativity, which suggests that time can be affected by speed and gravity. While time travel remains a theoretical concept, it captivates the imagination and inspires discussions about the possibilities of altering time.