- a processor, generally underclocked to limit heat output
- memory chips
- a storage chip and possibly a slot for additional storage
- a battery
- a graphics processor
- a sound processor and speakers
- sensors such as accelerometers, a compass and light sensors
- a GPS receiver
- a Wi-Fi antenna
- a Bluetooth chip
- an FM tuner
- at least one camera
These are the usual specs for an android tablet I believe our tablet was the Samsung A6. The description for it is right here: https://www.samsung.com/uk/tablets/galaxy-tab-a-10-1-2016-t585/