Node require module

The require function in Node.js is used to import modules. When require is called, Node.js follows a series of steps to locate and load the desired module. First, it checks if the module is a core module. If it's not a core module, Node.js then looks for the module in the current directory's node_modules folder. If the module is not found there, Node.js moves up the directory tree, searching each parent directory's node_modules folder until the module is found or the root directory is reached. If the module is still not found, Node.js will look through the directories specified in the NODE_PATH environment variable. If the module is not found in any of these locations, Node.js will throw an error.