The offered Unifi switch is a range of fully managed, PoE+ Gigabit switches that deliver robust performance and intelligent switching for scalable networks. It also offers additional fibre uplink connectivity options. It is a software-defined networking ecosystem with multiple product lines, generations. It is used to obtain an IP address (connected devices will also obtain IP addresses after deployment). Unifi switch is used to ensure people cant just go plugging hardware into your network and having that hardware automatically work.