Ether (Ether, ETH) is the native cryptocurrency of the Ethereum blockchain platform, the second most important in the industry. In traders' jargon there are playful distortions of the name — "kefir," "efir," "zemfir" — but they always refer to one asset.

A client (Client) is a program that enables a user to interact with a blockchain network: transfers, balance checks, and data synchronization. The most familiar example of a client is a cryptocurrency wallet.

A coin (Coin) is a unit of cryptocurrency that runs on its own independent blockchain. This is exactly what distinguishes a coin from a token, and the word itself is often part of the names of many cryptocurrencies.

Cryptography is the science of methods for protecting information by means of encryption. It ensures confidentiality and data integrity and underlies the operation of all cryptocurrencies.

A cryptographer is a specialist in the field of cryptography who develops and analyzes methods of encryption and data protection. Their work underlies the security of blockchain systems.