Everywhere in the world is full of good and bad people. Similarly, the internet is filled with lots of good and bad people. These bad people on the internet are called hackers — and they constantly wait for opportunities to steal things. Hardware wallet  is offline wallet is not connected to the internet. So, it is impossible for hackers to get access to it. The only way someone can access your Bitcoins is if they get hold of your hardware wallet and are able to unlock it.