What is straight?

A straight line is like the path a pencil takes when you draw from one edge of a paper to the other without lifting it up.

Imagine you're walking on a long, flat sidewalk. If you walk in one direction without turning left or right, your path is straight, just like the line you drew with your pencil.

Think about a ruler. When you use it to draw a line, it helps keep everything straight. The ruler doesn’t bend or curve, it stays the same from one end to the other. That’s what makes the line you draw straight too!

Now imagine you're walking again, but this time you take a turn, like going around a corner of a room. Your path is no longer straight, because you changed direction.

So, a straight line is just a path that doesn’t bend or curve, it goes on and on in one direction, just like your walk on the sidewalk.