Curved spacetime is a concept from Einstein's General Relativity that describes how massive objects, like planets and stars, warp the fabric of space and time around them. Instead of thinking of gravity as a force pulling objects together, it is better understood as the effect of this curvature. Objects move along the curves created by mass, which explains why planets orbit stars. This idea helps us understand various phenomena, such as the bending of light around massive objects, known as gravitational lensing. It also plays a crucial role in predicting the behavior of black holes and the expansion of the universe, providing a deeper insight into the nature of gravity.