The adapter goes hand in hand with the iPad’s display mirroring feature.
This means you could use it with apps that don’t support video output.
But, is the Digital AV Adapter the best option?

Apple
Why Shouldn’t You Buy the Digital AV Adapter?
There are two ways to sling your iPad’s picture to your HDTV’s screen.
The first is Apple’s Digital AV Adapter, and it does a good job of it.

Lifewire
The second isAirPlay, and it does a better job.
AirPlay uses your WiFi internet to send video to your television.
This makes it a great wireless solution.

AirPlay is one of the coolest features of the iPad, but it can be frustrating when things go wrong.
You don’t even need to be in the same room as your television.
So long as you have a connection to your WiFi data pipe, you might use AirPlay.
This means no worrying about cables.

Apple TV with TvOS Onscreen Interface - 2015 Release.Image provided by Apple, Inc
Because there are no wires, you’ve got the option to still easily control the iPad.
This is great if you are playing a game and want to see it on your big-screen TV.
But How Much Does AirPlay Cost?

Apple’s Composite AV Cables.Apple
The Digital AV Adapter is pretty affordable and is available from Apple’s website or other retailers.
Apple TV also gives you access to buying or renting movies and television through iTunes.
Apple TV also works with music and photos.
Your shared iCloud Photo Library will also be available on Apple TV.
So it can work as a really cool screen saver.
But there’s one key area where the Digital AV Adapter is definitely the superior solution: portability.
Both devices must be on the same WiFi web connection.
If you need a very mobile solution, the Digital AV Adapter is still the way to go.
It’s also the most foolproof solution.
What If My TV Doesn’t Have an HDMI Port?
There are a few options for older TVs.
That’s obviously not the most eloquent solution.
you might find some options by searching Amazon for “HDMI composite” or “HDMI component.”
You could use it for anything that has HDMI out, such as a game console.