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our daily lives are filled with decisions big and small even simple choices like what to wear usually are the results of complex considerations what's the weather going to be like what will you be doing today do you feel like making an impression or keeping a casual but the world around us is constantly changing we want to adapt the choices we make to match the changing conditions what's true for humans is also true for computer programs we don't want our programs to always run in the same way they should respond to changing conditions in the last video we learned how to use boolean expressions to establish whether something is true or false we can now add something called a conditional statement to help guide the computers decisions based on that information the simplest conditional statement is an if statement it says that if something is true the computer should run a specific block of code let's say that you want to create a program that displays whether or not you are old enough to see a pg-13 movie so the question we want the computer to evaluate is if age is greater than or equal to 13 the question or boolean expression goes next to the if the block of code we want to run only if the condition is true goes inside the if statement so in our example whenever the expression age greater than or equal to 13 is true the program will write to the screen that you are old enough to see a pg-13 movie of course some people will not be old enough in these kind of situations we will want our programs to do something else when the condition is false in order to do this we will want to expand our if statements to include an else statement the commands contained in this elf statement only run if the boolean condition in the if statement is false you can add an else statement by either dragging out the AFL's block or by clicking the plus symbol in the bottom right corner of the if block you you [Music]