World line

Okay kiddo, let's talk about World Line. Imagine we draw a line on a piece of paper. This line is like a path that a person takes when they move from one place to another.

Similarly, every object in the universe has its own path, called a World Line. This path shows every position of the object as it moves through time and space.

Now, let's imagine a fly flying around in your room. It will have its own world line, showing its positions at different times. The fly's world line could look like a zigzag if it is flying around randomly or like a straight line if it's flying in a straight line.

The concept of world line is an essential part of physics because it helps us understand the behavior of objects in space and time. For example, if we know the world line of a rocket, we can make predictions about its movement and trajectory.

So, World Line is like a path that shows the journey of an object through space and time.