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A variable is a container you can store a[br]value in. When you use that variable in an

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algorithm, it opens up the container and looks[br]at the value inside. This lets you write smarter

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algorithms that behave differently depending[br]on the value stored in the variable. For example,

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if you wanted to write an algorithm to say[br]Happy birthday, you're turning 10! to my little

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brother, that's great now but when I run it[br]next year I'd want it to say, Happy birthday,

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you're turning 11! I could create a variable[br]called age to store my brother's age and write

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my algorithm to say Happy birthday, you're[br]turning 'age' instead. Because variable can

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change, every year I can update the variable[br]'age' to equal 'age' plus 1. In this puzzle,

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we're going to be using a variable that will[br]set the length of the line our artist draws.

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Later on in our code, the move forward block[br]will look at that length variable to see what

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value you've set it to.