When you have a quadratic equation, it is in the shape of an arch. Imagine a baseball being hit. It will go up for awhile. Then, reach its peak and then fall back down.
In this case, we call the peak the vertex of the parabola. And the y-coordinate would represent the maximum height of its path.
Here’s one. Matt was gifted $200 from his parents for his birthday. His friend gave him $100. How much money does Matt have now? 200+100=300 Matt has $300.