Spacetime is a fundamental concept in physics that combines the three dimensions of space with the dimension of time into a single four-dimensional continuum. This idea, introduced by Albert Einstein, revolutionized our understanding of gravity and the universe, showing that massive objects like planets and stars warp the fabric of spacetime around them. In this framework, the motion of objects is influenced not just by their position in space but also by their position in time. This means that events are not just located in space but also occur at specific moments, leading to fascinating implications for how we perceive time and the universe itself.