What would you do if someone threw 8,461 marables at you and expected you to catch them? Magento has this many php files in the app/code directory. Codepools are the children directories of the code folder and these serve as storage containers for different types of files in Magento. This tutorial will even explain how to create a new codepool. You won't need to create your own codepools in real life, but by going the extra mile, you will have great clarity and depth of understanding on this topic.