Bluetooth is a common secondary way for tablets to wirelessly communicate with other devices; the primary, and essential, method of wireless communication is by using WiFi. Bluetooth allows tablets to interact with such as Bluetooth speakers without being plugged into them. Although by no means essential, it can be a useful extra, although one that does tend to drain a tablet’s battery faster.
However, the Tagital T7K does not come with Bluetooth. This is not a huge problem, and it is not uncommon for such extras to not be included on budget tablets, but if Bluetooth is desired, the T7K is not a suitable tablet.