You can get an adapter for audio jack to lightning or USB-C port. But, I almost never see anyone use one over Bluetooth.
USB audio adapters are barely even a thing, and the Lightning dongles often suck ass. I mean nearly-unusable sound quality, with weird hiss blasting because of some defective automatic gain function (for example; that was a Belkin).
Getting rid of the headphone jack was indefensible, but people putting up with it was even worse. Worst of all is cheerleading for that anti-customer, anti-quality move.
It doesn't fit a charger, but it should be able to use hubs now.
Qi/MagSafe helps with this
Oh, then you need to run another wire for the audio. Whereas with the ancient 30-pin iPod port, you got an audio line out AND power in. And the cool thing about that one is that it was a true line-out: The volume control didn't affect it, so you didn't have to dick around with the volume on two devices (the player and the car radio).
I bought the Lightning-to-30-pin adapter from Apple, and it duplicates all of that. You get the audio line out and power in. A cheap Y cable with USB for power and 1/8" plug for audio solves everything. As far as I know, it's the only solution that Apple has ever sold for a problem it deliberately created. And I doubt anyone, statistically, is even aware of it.
Neither of the other two vehicles in our household have Bluetooth at all, but they both have aux inputs. Bluetooth is a shitty workaround to intentional, anti-consumer stupidity. Just as almost every car (even cheap-O rental cars) integrated auxiliary audio inputs, Apple removed the audio output from their best-selling music player (the iPhone). And when gutless consumers allowed them to get away with it, everybody else followed suit and now we've regressed decades.
Twenty years ago I built an iPod dock into my car, into which I could plop my iPod (and later iPhone) and get power into the phone and audio directly into the stereo system. The phone charged, and delivered good audio quality. As a bonus, it did so without the need to dick around with two volume controls, since the 30-pin connector had a proper (fixed) line-level audio output that didn't vary with volume adjustments on the phone.
This is a level of convenience and performance that very few people enjoy now, and that is pathetic. Manufacturers have intentionally degraded so many of our consumer-electronics experiences with no payoff for us, and very questionable payoff for them.
Did you know that the microphone on the wired Apple earbuds don’t work on anything other than Apple devices? Well, one nice thing about the adaptors is that they allow you to use those earbuds on any computer with a USB-C port. I’ve avoided buying new headsets thanks to them.
Speakers use Bluetooth or a lightning jack in a cradle.