Okay kiddo, so let me explain what a subdomain is. Imagine you have a house, and you want to divide it into different sections for different purposes. For example, you might have a playroom to play with your toys, a kitchen to cook food, and a bedroom to sleep in. Now, imagine your house is like a website, and each section or room is like a subdomain.
A subdomain is a smaller division of a website that is part of the main website but has its own web address. It's like a room in a house but for a website. So if the main website is called example.com, a subdomain might be play.example.com, where "play" is the subdomain and "example.com" is the main domain.
Companies might use subdomains for different parts of their website, like having a blog on blog.example.com or an online store on shop.example.com. This way, visitors can easily find what they're looking for and access different sections of the website without getting lost. It's like having signs that tell you which room to go to in a big house.
Overall, a subdomain is just a way to organize and separate different parts of a website, kind of like how you organize your toys in your playroom, your clothes in your bedroom, and your food in your kitchen.