How is it possible to have a bitcoin wallet offline?

[Aya]

I also think the same as you. It seems not familiar and rarely hears. But I know an offline wallet that provides good security for Bitcoin, It is Segwit. If someone here ever knows about it, I think he will recommend using the wallet. It is also a recommended wallet to use.

I am using an offline wallet as well and I really do recommend it! There are many available hardware wallets where you can store you private keys and I attest that it is a lot safer and more secure than online wallets. I had an online wallet before but it has been hacked.