A smart home hub is like a central control station for all the different "smart" devices in your home, like lights, doors, locks, and even appliances. It allows these devices to talk to each other and to you. For example, you can use the hub to set a rule that whenever you enter your house, the lights should turn on or you can say "OK Google, lock the front door," and it will lock it! Basically, a smart home hub makes it really easy to control all the "smart" things in your home.