# Blockchain Basics

- [What Is Blockchain?](/en/blockchain-basics/blockchain-definition.md)
- [What Is a Decentralized Wallet?](/en/blockchain-basics/what-is-a-decentralised-wallet.md)
- [What is a USDT Wallet and How Does it Work?](/en/blockchain-basics/what-is-a-decentralised-wallet/what-is-a-usdt-wallet.md): This article takes a deep dive into what a USDT wallet is, how it works, and what to look out for when choosing one.
- [What Is the Private key, Mnemonic and Wallet Password](/en/blockchain-basics/what-is-the-private-key-mnemonic-and-wallet-password.md)
- [What Is the Gas Fee?](/en/blockchain-basics/what-is-the-gas-fee.md)
- [What Is DeFi ?](/en/blockchain-basics/what-is-defi.md)
- [What Is DEX ?](/en/blockchain-basics/what-is-dex.md)
- [What is keystore](/en/blockchain-basics/what-is-keystore.md)
- [What is a cold wallet](/en/blockchain-basics/cold-wallet.md)
- [What is a hot wallet](/en/blockchain-basics/hot-wallet.md)
- [What is a watch wallet?](/en/blockchain-basics/watch-the-wallet.md)
- [What is a multi-sig wallet?](/en/blockchain-basics/multisig.md)
- [What is a hardware wallet](/en/blockchain-basics/hardware-wallet.md)
- [What is an extension wallet?](/en/blockchain-basics/plug-in.md)
- [What is a passphrase](/en/blockchain-basics/passphrase.md)