# Glossary of Terms

OCTO defines core terms that are re-used throughout the specification. Below we include some of the key terms you need to know before getting started. Refer to [Schemas](https://docs.octo.travel/getting-started/schemas) for detailed definitions of fields used in the specification. 

<table><thead><tr><th width="135">Term</th><th>Definition</th></tr></thead><tbody><tr><td><strong>Reseller</strong></td><td>The reseller, connecting to the Supplier via the API, to further distribute their Products</td></tr><tr><td><strong>Supplier</strong></td><td>The provider of Products, which Reseller is connecting to.</td></tr><tr><td><strong>Product</strong></td><td>The attraction, activity or tour offered by Supplier.</td></tr><tr><td><strong>Option</strong></td><td>A variant of the Product. All products must have at least one option.</td></tr><tr><td><strong>Unit</strong></td><td>The ticket type, e.g. Adult, Child, Senior, etc.</td></tr><tr><td><strong>Unit Item</strong></td><td>A line item per unit within the booking.</td></tr><tr><td><strong>Booking</strong></td><td>A booking made for a specific Product and Option and one or more Unit Items.</td></tr><tr><td><strong>Voucher</strong></td><td>A single admission document (barcode, QRcode, PDF, etc.) that can be used for the entire booking.</td></tr><tr><td><strong>Ticket</strong></td><td>An admission document (barcode, QRcode, PDF, etc.) that can be used per unit item.</td></tr></tbody></table>