Apple Remote Desktop is management software from Apple that lets administrators remotely manage multiple Mac computers across a network. It is installed on the administrator's Mac and communicates with the managed Macs. The version Apple currently lists, 3.10, requires macOS Sequoia 15.5 or later and adds support for macOS Tahoe 26. IT departments use it to manage fleets of Macs. It is installed software rather than a hosted service, and it is not open source.
Apple Remote Desktop is a product of Apple Inc., a US group. Because the program runs on your own computers and network, sessions and screen data stay within your infrastructure, so the data location is largely your own choice. According to Apple's privacy policy, personal data of individuals in the EEA is controlled by Apple Distribution International Limited in Ireland, and transfers rely on standard contractual clauses. Apple is a US company and subject to legislation such as the CLOUD Act, although this matters less for locally running software than for cloud services.