Even if you've ditched CDs in favor of a digital music collection, or even a subscription to a service like Spotify or Apple Music, your car probably still has a CD player in it. And if you do still listen to CDs in your car, then there's a strong argument to be made in favor of investing in a CD changer so you can shuffle through multiple CDs without swapping out, even in these days of Pandora and Spotify.
Compact disc changers are devices that overcome a couple of the major issues that are typically encountered when listening to CDs on car audio systems.
The biggest hurdle that the compact disc format suffered from initially was its tendency to skip and stutter when shaken, which was a huge stumbling block for early car CD players. Various shock protection measures have rendered that a non-issue, but a couple of glaring problems still remain.