As you already know, your iPad has a feature called "Airplay Mirroring", which allows you to project the "mirror image" of whatever is on the screen onto a projector. So rather than having your iPad tethered to a cable that connects to the projector, why not have the freedom of moving around the room with your iPad in hand? A wireless connection, utilizing the iPad's ability to project the mirror image of what is on your device, giving you power, flexibility, and control.
The Apple TV is made for the iPad. It is the "Screen Mirroring" icon that you are looking. For iPads that run on iOS 12 or later, swipe down from the upper-right corner of the screen to bring up the AirPlay menu. You will see the image set forth below. Touch “Screen Mirroring.” For iPads that run on iOS 11 or earlier, swipe up from the bottom of the screen to bring up the AirPlay menu. Then touch “Screen Mirroring.”
Now touch “Screen Mirroring.” When an Apple TV is connected to the same wireless connection as your iPad, it will show up when you touch the Screen Mirroring icon, indicating it is ready for project your iPad image.
Select your Apple TV
Now select your Apple TV [BOB’S APPLE TV in this image]. Your iPad will now connect to the Apple TV and the screen of your iPad will be “mirrored” on the projected screen or the external monitor.
Connecting your Apple TV to your TV monitor or Projector
This is a simple HDMI cable connection. Here, you may want to have more than one length of HDMI cable. Sometimes you can place your tethered Apple TV/Airport Express right next to the projector, and sometimes you can't. Carry more than one length with you so you have flexibility in the setup process.