Okay kiddo, imagine you have a piece of paper where you want to draw a picture of a house. You need to know where to put the different parts of the house on the paper so they look right, right? So, to do that, you have to create lines that help you know where everything should go.
Now, imagine you draw two lines on the paper, one going from left to right and one going from up to down. These two lines cross each other in the middle and create four squares on the paper - these little squares are called "quadrants."
The line going from left to right is called the "abscissa" and the line that goes up and down is called the "ordinate." They are two lines, that meet at a point, similar to how two roads meet at an intersection.
By using the abscissa and ordinate together, you can pinpoint the exact spot where you want to draw something on your paper. For example, if you want to draw the chimney of your house in the top right corner, you might say that the abscissa is 4 and the ordinate is 1. That way, you can easily draw the chimney in the right spot on the paper.
So basically, the abscissa and ordinate are two lines on a paper that help you figure out exactly where to put things when you're drawing or doing math. Does that make sense, kiddo?