Trezor is a hardware wallet, a small electronic device that stores the private keys to your crypto and keeps them off the internet. It is made by SatoshiLabs, a company in Prague. The first model, the Trezor Model One, was created in 2014 and is described by the maker as the world's first hardware wallet. Later devices, including the touchscreen Model T and the newer Safe range, followed the same idea.
The point of a hardware wallet is cold storage. Your private key never leaves the device and never touches an internet-connected computer, which protects it from malware and remote attackers. When you want to move funds, the Trezor signs the transaction on the device itself, and you confirm the details on its screen before anything is sent. This is what people mean when they call it cold storage: the secret that controls the money stays offline.
Trezor is a self-custody wallet, so you hold the keys and no one else can move your funds or freeze your account. That control comes with responsibility. Setup creates a wallet backup, a list of recovery words you write down and keep safe. Anyone who has those words can restore the wallet and spend the funds, and if you lose them with no other copy, the funds cannot be recovered. The device adds a PIN, which the maker says can be up to 50 digits, to block anyone who gets physical access to it.
The wallet supports a broad range of cryptocurrencies across major blockchains, including Bitcoin. The exact list changes over time as support is added, so check the current coin list on the official site rather than relying on a fixed number. Trezor connects to a computer or phone over USB and works with the maker's Trezor Suite software for managing balances and sending transactions. Much of the firmware and software is published openly, which lets outside researchers inspect how it works.
Trezor sits at the cautious end of crypto storage. It costs money and takes longer to set up than a phone app, and it is built for holdings you want to protect over time rather than for quick everyday spending. A common pattern is to pair it with a software wallet: small amounts in the phone wallet for daily use, and the bulk of savings behind the hardware device. For current device options and pricing, check the official Trezor site, since the lineup and prices change.