Ports are one of the ways in which tablets communicate with other devices (WiFi and Bluetooth are two other methods) and they are also used for expanding the tablet’s capabilities and recharging it.
The Samsung Galaxy Tab E Lite Kids comes with a memory card slot, allowing the available memory to be expanded, and a USB charger/accessory port, which is what is used to charge the battery and connect it to other devices such as desktop and laptop computers. It also has a single speaker, a 3.5mm headphone jack, an integral microphone and a camera. There are cut-outs in the case for the various ports.
The power, home, back, recent and volume buttons are also built into it.