A transaction fee is the payment the sender of a transfer pays the network for processing and confirming the operation. Its amount depends on the network load and the priority of the transfer.

Bitcoin's public ledger is a publicly accessible record of all the network's transactions since its launch. Any participant can verify operations, which ensures the transparency of the blockchain.

A crypto evangelist is a person who works on educating people and popularizing blockchain and cryptocurrencies, explaining their principles to a wide audience.

A cryptocurrency faucet is a website or service that gives out small portions of coins in exchange for completing simple tasks or for user activity.

A QR code is a two-dimensional graphic image that encodes data and is read by a camera; in cryptocurrencies it is used to quickly transmit addresses and payment details.