HomeAssistant Zigbee

Zigbee is an IEEE 802.15.4-based specification for a suite of high-level communication protocols used to create personal area networks with small, low-power digital radios, such as for home automation, medical device data collection, and other low-power low-bandwidth needs, designed for small scale projects which need wireless connection.

Hence, Zigbee is a low-power, low data rate, and close proximity (i.e., personal area) wireless ad hoc network.

Zigbee2mqtt

Home Assistant integrates well with Zigbee. However, you need to have a bridge to talk to the Zigbee appliances.

It is possible to have that on the cheap with Zigbee2mqtt.