Glossary

Graphical User Interface (GUI)

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A Graphical User Interface (GUI) is a software application that allows users to interact visually with an underlying software which might otherwise only be accessible through the command line. GUIs are meant to hide the complexities of software and present the user with a simple, intuitive interface. Most applications which include a GUI can also be used without the GUI through the command line.

Most Bitcoin software comes with a GUI, including Bitcoin Core, whose GUI is called Bitcoin-Qt. Most Bitcoin wallets provide GUIs as well.

Related Terms
Bitcoin Core
Bitcoin Core is the reference implementation for the Bitcoin source code, meaning all other implementations look to Core for guidance. Bitcoin Core was started by Satoshi Nakamoto when they released the first version of Bitcoin's source code.
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Bitcoind
Bitcoind is the name of the software service that runs a Bitcoin node and wallet. This service comes with Bitcoin Core’s software and is used by most nodes on the network.
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Open Source
Open-source describes a project whose source code is publicly available and licensed such that individuals can use and alter the source code freely.
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