Throughout the 2000s and 2010s, Apple offered a line of Wi-Fi routers that it referred to as AirPort base stations. There was a standard AirPort Express, a higher-end AirPort Extreme with more advanced networking features, and an AirPort Time Capsule that doubled as an external storage drive for backing up a Mac with Time Machine.
Apple discontinued the AirPort line in 2018, and this week it shared more sad news that will impact the AirPort Time Capsule specifically.
As noticed by @StellaFudge, and by other users who have installed the first macOS Tahoe beta, the Time Machine page in the System Settings app now indicates that the next major version of macOS — aka macOS 27 — will no longer support the AirPort Time Capsule or any other storage drives that use the Apple Filing Protocol (AFP).
Read more at MacRumors.com