How can you use an iPhone to control Apple TV?

One can utilize an iPhone to control an Apple TV through the use of Apple's Remote app, which is integrated into the Control Center on devices running iOS 12 and later. To do so, ensure that the iPhone and Apple TV are both connected to the same Wi-Fi network. Next, swipe down from the upper-right corner of the iPhone screen (or up from the bottom edge on models with a physical Home button) to access the Control Center. From there, tap the Apple TV Remote icon, select the desired Apple TV, and enter the four-digit code displayed on the Apple TV if prompted. The iPhone can then be used as a touchpad for navigation, to enter text via the keyboard, or speak commands using Siri by pressing and holding the microphone button. This remote functionality offers a convenient alternative to the physical Apple TV remote and provides quick access to media controls directly from the iPhone.