Your iPad went into restore mode.
If your iPad model has been stuck on iOS 10 for all of these past years, then you own a nearly 8-1/2-year old, 2012 iPad 4th generation and NOT any version of the later iPad Air models.
If you never,,ever made any type of backups of the data on this iPad or any of the installed third party apps, then you need to know that the restore mode has permanently lost/detroyed all data on this iPad forever.
Also, since this iPad is so old, now, restore mode has possibly made this iPad unable to re-install any of the older third party apps you had installed on this iPad.
Apple ended support for all 8-10-year old iOS devices well over 4 years, ago, in 2016.
Third party app developers abandoned and stopped supporting these 8-10-year old iOS devices nearly 3 years, ago, in 2018.
There are, virtually, NO MORE third party apps available from the iOS App Store, any longer!
Third party compatible apps for such old devices are few and far between, now, in 2021.
AND, that well over 4-year old default iOS Safari Web browser is too old, not secure and not safe to use to access the Internet, any longer.
There are virtually NO MORE third party Web browsers left for 8-10 year old iPads!
Available and more popular third party Web browser choices are pretty much GONE, now.
If you must use these old iPad models, here is what is left for still updated Web browsers.
Pickins’ are slim, now!
ALook Web browser ( A fairly new Web browser primarily designed for old iOS device versions, but is still available to newer iOS/iPadOS devices, as well )
Dolphin Web browser
Maxthon Web browser
TOR private browser
TOR + VPN private browser
Turbo VPN private browser
This is pretty much it for iOS 9/10 compatible, third party Web browsers today.
Simply put, a 4th gen iPad is too old and obsolete now.
Sorry, but this is the reality for ALL 8-10-year old AND OLDER iOS devices now. Especially going into 2021!
With all this stated up front, if you wish to still try and get this old iPad going again,
you will need to have access to a full-featured computer, like a Mac or Windows PC, try either using the Finder on a Mac that has the newest macOS Catalina installed OR with an older Mac with an older Mac OS, download and install the latest iTunes version ( or latest iTunes for Windows PC ), make sure the Mac or Windows PC is connected to the Internet, connect your iPad by the USB charge cable to the computer and let the iTunes application start the iPad reset/restore procedures.
If you are successful in geting this iPad going again, there is one last thing you can try/attempt, if you need to get back your older versions of any of your previously installed apps ( you won't have any data, but you maybe able get some or all of your previously installed apps back into that iPad ).
If you own much newer iOS device that can run either iOS 12 and.or iOS/iPadOS 13 and later, you can install the most recent app/s onto that more recent iOS device.
Then go back to your older iPad, open the iOS App Store, go to the Purchases section of the store app, search for the app/s you wish to try and download to that older iPad and see if an older version of the app is allowed to be downloaded/installed to that older iPad.
These newer iOS/iPadOS devices must use your same Apple ID user account and password as the older device you ard trying to get an older app for.
Failing that OR IF NO joy, then there is nothing more to be done.
It's 2021 now!
If you need/want an iPad with an up to date iPadOS with access to current, updated apps, then you really need to seriously consider a purchase of a new iPad model OR a much, MUCH “newer” and less expensive, used iPad models, from better known, trusted Apple product/device retailers/resellers, locally or online, capable of running the latest iPadOS versions.
There are PLENTY of newer, older iPad models that can run the latest, current versions of iPadOS.
Sorry & Best of Luck to You!
