Geth is short for "Go Ethereum," which is an open-source software that allows users to run a full node on the Ethereum blockchain. It is written in the Go programming language and is one of the most popular clients for interacting with the Ethereum network. Geth enables users to mine Ether, the native cryptocurrency of Ethereum, and participate in the network by validating transactions and blocks. In addition to mining, Geth provides a command-line interface for developers and users to interact with smart contracts and decentralized applications (dApps) on the Ethereum platform. It supports various functionalities, including creating accounts, sending transactions, and querying blockchain data, making it a versatile tool for anyone interested in the Ethereum ecosystem.