# Glossary

This Glossary provides definitions of common ARI (Availability, Rates, and
Inventory) terms.

## ARI (Availability, Rates, and Inventory)

A pricing delivery mode that controls nightly rates, availability, and
inventory, and provides constraints on how these can be combined.

## Availability

Indicates whether the combination of room type and rate plan
is allowed to be sold on a specific date.

## ID

Google uses "ID" for the identifier for room type and package (rate plan);
whereas, OTA XML uses "code". You must create your own IDs since Google
doesn't generate them.

## Inventory

The number of physical rooms that are available to be sold for a specific date
range.

## Package

Defines the different ways that a room type can be sold. Also known as
rate plan.

## Package ID

The unique identifier for a rate plan (or package). Also known as rate plan ID.

## Product

The room type and rate plan combination that is referenced as the sellable
product. Also known as room rate.

## Property data

Defines room type and package (rate plan) information.

## Property ID

The unique identifier for the hotel or property.

## Rate (rate amount)

The nightly occupancy pricing per product for a specific date range.

## Rate plan

Defines different ways that a room type can be sold. Rate plans may be priced
differently because refundability and value-adds, such as free breakfast,
are offered, or because they have additional constraints on
availability, such as early or late booking. Also known as package.

## Room rate

The combination of room type and rate plan that is referenced as the sellable
product. Also known as product.

## Room type

The type of room being sold, such as a King room with an ocean view.

## Room type ID

The unique identifier for room type.