A hardware wallet is a physical device that looks something similar to a flash drive. It is a more secure way to store your Bitcoin than a mobile wallet, as it is only very briefly in contact with the internet when sending a transaction, if at all.
This means that it is far harder to hack than a mobile wallet and as such should be used for storing larger amounts of value than a mobile wallet.
Typically, values of greater than R50k should be held on a hardware wallet, rather than a mobile wallet.
This is the most entry level wallet from Ledger.com. It does the trick but cannot be used in certain multisig setups, such as the Blue Wallet Vault.
A more advanced hardware wallet, which has Bluetooth capability, meaning you can sync it with a mobile phone which allows for a better user experience.
The gold standard in hardware wallets. Completely open source code and hardware schematics means that many sets of eyes are constantly looking at the code and design, constantly improving the security model. You don’t get a better hardware wallet than this, however you will have to import it from Canada, which is a bit of a pain.