apple id

Your iPad is evidently Activation Locked.

Here are the Apple support pages that outline the Activation Lock - and the only mechanisms by which it can be turned off:

Activation Lock for iPhone, iPad, and iPod touch - Apple Support

Turn off Activation Lock – Apple Support

As you will discover, unless you are the owner of the AppleID that was last used to activate the device, you’ll not be able to defeat or bypass the Activation Lock. With documentary evidence that you are the original owner (such as sales receipt showing the serial number), Apple may be prepared to assist - otherwise they and nobody here will be able to help you.

shahinsaghar Said:

"apple id: i forgot my apple id and password for my ipad and ipad locked to owner what should i do?"

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Getting Back In:

If this is locked to another owner than you, the you should return this to the original owner. They should have known better, and used this link, prior to selling it: What to do Before you Cell, Give Away, or Trade in your iPhone, iPad, or iPod touch - Apple Support. If they do not sign out of it, then it is useless to you.

If you've forgotten the passcode on your iPad (or your iPad is disabled) here’s the steps to follow:

https://support.apple.com/en-gb/HT211078