We need to take care of a few nuts and bolts of exponential functions before we put everything together. First of all, what is an exponential function? What do they look like? What are they used for? These are all questions we are going to dive into. Don't worry. We'll keep things interesting with a few real life situations like zombies taking over the world or population explosions. We'll also hit a few key vocabulary words about exponential functions that will make things easier as we get into this chapter. Buckle up and get ready for a ride.