Hollis Johnson/Business Insider
I highlight the word "support" because it means that Apple's new iPhones don't actually come with fast chargers included.
If you want to fast charge your new iPhone 8, iPhone 8 Plus, or iPhone X, you'll have to spend extra cash to buy the necessary chargers and cables.
Specifically, you'll need a charger that comes with the USB-C "Power Delivery" standard. As you'd expect, Apple has you covered with its $49 29W USB-C charger and $25 USB-C-to-Lightning cable. Luckily for you, Apple says you can use a "comparable third-party USB-C power adapter that supports USB Power Delivery (USB-PD)," and I've found a few the third-party chargers that come with USB-C Power Delivery that are less expensive as Apple's 29W charger.
If you own a USB-C Mac laptop, like the 12-inch MacBook, you can use the USB-C charger that came with it to fast charge your new iPhone. Still, it's not a bad idea to get a separate fast charger for your new iPhone so that you're not using one charger for two devices.
Still, though, you'd need Apple's own $25 USB-C-to-Lightning cable to plug your new iPhone into your Mac laptop's USB-C charger - and unfortunately, there's no cheaper third-party Made For iPhone (MFI) USB-C-to-Lightning cable available to buy at the time of writing.
Right now, there aren't many third-party USB-C Power Delivery chargers from well-known companies out there. But that's likely to change as the iPhone 8, iPhone 8 Plus, and iPhone X start shipping. For now, though, check out the available third-party USB-C Power Delivery chargers to fast charge your new iPhone 8, iPhone 8 Plus, or iPhone X (if you plan on getting one in November):