In the world of "unlimited" Wi-Fi, the limit is often hidden within the Fair Usage Policy (FUP). While you may not be charged for extra data usage, most providers (especially in hotels, on cruise ships, or for international roaming) will "throttle" your speed after you reach a certain threshold, such as 1GB or 2GB in a single day. This means your high-speed connection is downgraded to 2G or 3G speeds, making video streaming or large downloads nearly impossible. Furthermore, "unlimited" Wi-Fi on airplanes or public networks often has a concurrency limit, restricting how many devices you can connect at once. Technically, the "limit" is the physical bandwidth of the router; if 200 people are using "unlimited" Wi-Fi simultaneously, the speed for everyone drops to a crawl. So, while the quantity of data might be infinite, the quality and velocity of that data are very much finite. Always read the fine print of your "unlimited" plan to see when the throttling kicks in, especially if you plan on using the connection for data-heavy work or high-definition media during your travels.