What is the difference between using "../" and "/" in PHP to navigate directories?

Using "../" in PHP allows you to navigate up one level in the directory structure, while using "/" allows you to navigate to the root directory. When navigating directories in PHP, it's important to understand the relative paths and how they affect the file system. By using "../", you can easily move between directories without hardcoding specific paths.

// Example of navigating up one level using "../"
include('../config/config.php');