Application: Communication System Link Budget Calculation
A LInk Budget is used to calculate how much power you need in order to establish and maintain a communication link. The concept of power is used somewhat differently in communication, where you are trying to send signal data through the air.
The very nitty gritty: Stuff you will learn in later classes, but is cool to see. Don't worry if you don't understand it all.
Here is a cool Link Budget Calculator.