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# Words used on this site

**BIOS**, or **firmware**
:   A small program inside a console. It starts the games.

**Emulator**
:   An app that acts like a console.

**Core**
:   One emulator inside RetroArch. RetroArch uses a different core for each
    console.

**Setup**
:   What you play with: RetroArch, Batocera, EmuDeck and others.

**BIOS folder**
:   The folder where your setup looks for BIOS files.

**Pack**
:   The ZIP file with every BIOS file for one setup.

**Platform**
:   A setup, as the project's data calls it.

**ZIP**
:   One file that holds many files. You unzip it to get them out.

**Terminal**
:   A window where you type commands.

**Installer**
:   The small program the command starts. It fills your BIOS folder.

**Hash**
:   A fingerprint of a file's contents. A different file gets a different hash.

**MD5** / **SHA-1**
:   Two kinds of hash, a file's fingerprint. Setups that check files list one.

**Region**
:   Where a console was sold: Japan, North America, Europe.

**Required** and **optional**
:   Required: games do not start without it. Optional: games start anyway.

**Game data**
:   Files from your own copy of a PC game, like Doom. Not a BIOS.

## Next steps

- [What is a BIOS?](what-are-bios-files.md)
- [Get your files](../which-pack.md)
- For contributors: [Terms of the reference pages](reference-terms.md)