Think about how your toy car moves on a straight road. If you know how far it goes for every second, you can draw a line to show its path. Used to identify the international between two variables, this often shows the strength and direction of a trend.
Linear regression is like drawing this line. It helps you understand how two things are connected. For example, if you eat more ice cream, your smile might get bigger. Linear regression checks if this is true and how strong the connection is.