3G is a fancy way for your phone to get internet access when you are not connected to Wi-Fi. It's like having a magic wand that connects your phone to the internet wherever you go, so you can watch videos, send messages, and browse the web.
You know how sometimes you have to wait forever for a video to load? Well, with 3G, your phone can download information really fast, so you don't have to wait and get bored.
Just like how you sometimes need to wear shoes to protect your feet, your phone needs 3G to protect its connection to the internet. It keeps your phone safe and secure while you use it.
Without 3G, your phone would only work on Wi-Fi, and you'd have to stay in one spot to use the internet. But with 3G, you can use your phone anywhere, just like a superhero with awesome powers to connect to the internet!