Calculus is a type of math that helps you understand how things change over time. It was first invented a long, long time ago by a man named Isaac Newton and another man named Gottfried Leibniz. They came up with two different ways to do calculus, but they both basically did the same thing.
Over time, people started using calculus to do more and more complicated things, like figuring out how to make satellites orbit the Earth or how to design the fastest cars. As people worked with calculus more, they started to realize that there were some problems with the way it worked.
So, they started coming up with new ideas and methods to improve calculus. This is called mathematical analysis. People started using these new methods to solve even more complicated problems and to understand more about how things change over time.
Today, calculus and mathematical analysis are still really important in many fields, like engineering, physics, and economics. People are always trying to find new ways to use calculus and improve on it, so it can help us solve even more complex problems in the future.