Each Unfi Network Switch, Access Point, Router or Camera needs to be connected to a UniFi OS Console.  The UniFi OS Console provides remote access, management and recording features.   Please note that the UDM Unifi Dream Machine, only supports Unifi Network and not Unifi Protect.  The Unifi Cloud Key Gen 2 is the only device that already includes a harddrive for data storage.  The others will need additional harddrives or memory cards to allow them to record footage.  There is also a software version of the Unifi Network controller if you only want to manage routers, access points and switches.  This can be found on Ubiquiti's website here.

This is an optional step and is not needed if you have already chosen the UDR, UDM, UDM-Pro or UDM-SE or you don't need a router

Please note this is not a full list of all UniFi Switches, but a selection of the most common.  A full list can be found here

Ubiquiti have a large number of wireless access points options and some of the most common are listed below.   A full list can be found here

If you are looking to add on cameras and create a Unifi Protect solution, then optionally choose a camera from the options below