on its instructions and on the text that the player typed on the keyboard (the program' inputa program is just collection of instructions that act on the user' input "what kind of instructions?there are only few different kinds of instructionsreally expressions are values connected by operators expressions are all evaluated down to single valueas evaluates to or 'hello'worldevaluates to 'hello worldwhen expressions are next to the if and while keywordsyou can also call them conditions assignment statements store values in variables so you can remember the values later in the program the ifwhileand break statements are flow control statements that can cause the execution to skip instructionsloop over instructionsor break out of loops function calls also change the flow of execution by jumping to the instructions inside of function the print(and input(functions these functions display text on the screen and get text from the keyboard this is called / (pronounced like the letters"eye-oh")because it deals with the input and output of the program and that' itjust those four things of coursethere are many details about those four types of instructions in this book you'll learn about new data types and operatorsnew flow control statementsand many other functions that come with python there are also different types of / such as input from the mouse or outputting sound and graphics instead of just text for the person using your programsthey only care about that last typei/ the user types on the keyboard and then sees things on the screen or hears things from the speakers but for the computer to figure out what sights to show and what sounds to playit needs programand programs are just bunch of instructions that youthe programmerhave written post questions to