> ## Knowledge Base Index
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> Use this file to discover available pages before exploring further.
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# Glossary

### Introduction

Definitions for the terms used across Ship24 and our documentation. Terms are listed alphabetically.

###### A

* **Add-on** - A paid option added on top of a Pro plan, such as Proof of Delivery or the AI Predictive Delivery Date. See [Ship24 pricing and plans explained](https://help.ship24.com/en/article/ship24-pricing-and-plans-explained-425d9d/).
* **AI Predictive Delivery Date** - Ship24's own delivery estimate, available for almost every courier as a date range. Unlike the courier's estimate, it is recalculated as the parcel moves. Available as an add-on. See [AI Predictive Delivery Date](https://help.ship24.com/en/article/ai-predictive-delivery-date-dbx6rk/).
* **API Key** - The credential used to authenticate your requests to the Tracking API. Yours are in your dashboard under Integrations.

###### B

* **Branded Tracking Page (BTP)** - A tracking page you customise with your own branding, so customers track orders on a page that looks like your store. See [setting up your Branded Tracking Page](https://help.ship24.com/en/article/setting-up-your-branded-tracking-page-13vfcxl/).

###### C

* **Courier** - The logistics provider carrying the shipment, such as DHL, FedEx or UPS.
* **Courier Code** - The identifier Ship24 uses for a courier, for example `dhl`. The full list is in the [Ship24 courier list](https://docs.ship24.com/couriers).
* **Custom Domain** - Your own domain used for your Branded Tracking Page, so customers see your address instead of a ship24.com one. See [using a custom domain](https://help.ship24.com/en/article/using-a-custom-domain-for-your-branded-tracking-page-yuqybj/).

###### D

* **Delivery Notifications** - Emails sent to your customers as their shipment progresses. See [customizing your Delivery Notifications](https://help.ship24.com/en/article/customizing-your-delivery-notifications-1qz8zip/).

###### E

* **Estimated Delivery Date (EDD)** - The delivery date given by the courier. Not every courier provides one, and when they do it is often set once and not updated after a delay. Ship24 can also provide its own estimate, the [AI Predictive Delivery Date](https://help.ship24.com/en/article/ai-predictive-delivery-date-dbx6rk/), which updates as the parcel moves.
* **Event** - A single tracking update recorded by a courier, with a status, a time, and usually a location.
* **Exception** - A shipment that ended with a problem: returned to sender, lost, or undeliverable for another reason. See [understanding shipment delivery statuses](https://help.ship24.com/en/article/understanding-shipment-delivery-statuses-1rikrd6/).

###### I

* **IOSS (Import One-Stop Shop)** - A European Union system that simplifies VAT collection for businesses selling goods to EU customers.

###### M

* **Milestone** - One of the standard stages a shipment passes through, used to group the many different wordings couriers use. See [understanding shipment delivery statuses](https://help.ship24.com/en/article/understanding-shipment-delivery-statuses-1rikrd6/).

###### O

* **Overage** - Shipments or API calls used beyond your plan's monthly allowance, billed on your next invoice.

###### P

* **Pending** - A shipment that has been added to Ship24 but has no tracking data yet. See [why the shipment status is Pending](https://help.ship24.com/en/article/why-is-the-shipment-status-pending-wk75bm/).
* **Per-Call Plan** - A Tracking API plan where every API call counts against your quota, suited to occasional one-off lookups. Different from the per-shipment plans, and it uses different endpoints.
* **Per-Shipment Plan** - A Tracking API plan where one tracker counts as one shipment, whatever happens to the parcel afterwards. This is the option most integrations use. See [understanding your API usage and quota](https://help.ship24.com/en/article/understanding-your-api-usage-and-quota-1crxjei/).
* **Primary Tracking Page** - The tracking page marked with a star when you run several. It is the page your delivery notification emails link to.
* **Proof of Delivery (POD)** - Evidence a courier records at handover, such as a signature, a delivery photo or a receipt. Available as an add-on. See [what Proof of Delivery is](https://help.ship24.com/en/article/what-is-proof-of-delivery-pod-and-how-to-get-it-gsbny2/).

###### Q

* **Quota** - The number of shipments or API calls your plan includes each month. See [understanding your API usage and quota](https://help.ship24.com/en/article/understanding-your-api-usage-and-quota-1crxjei/).

###### R

* **Rate Limit** - A cap on how fast you can call the API. This is not the same as your quota: a rate limit means slow down, a quota means you have used your monthly allowance.

###### S

* **Sending Domain** - Your own verified email address or domain, used so delivery notifications come from you instead of Ship24. See [how to send Delivery Notifications using your own email address](https://help.ship24.com/en/article/how-to-send-delivery-notifications-using-your-own-email-address-a50w6d/).
* **Shipment** - The physical parcel being transported.
* **Shipment Dashboard** - The interface where you add, monitor, filter and export your shipments. Included in the Tracking Solution, and available as an add-on on Tracking API plans.

###### T

* **Tracker** - The object Ship24 creates when you ask it to follow a shipment. One tracker equals one shipment from your quota. See [how to create a good shipment tracker](https://help.ship24.com/en/article/how-to-create-a-good-shipment-tracker-fa7b2q/).
* **Tracking API** - The product that lets you track shipments from inside your own system. It comes in two forms, per shipment and per call. See [getting started with the Ship24 Tracking API](https://help.ship24.com/en/article/getting-started-with-the-ship24-tracking-api-m8s3iw/).
* **Tracking Number** - The identifier the courier assigns to a shipment.
* **Tracking Pages** - The section of your dashboard where your Branded Tracking Pages are managed.
* **Tracking Solution** - The all-in-one product, which includes the Shipment Dashboard, Branded Tracking Pages and Delivery Notifications without any integration work.
* **Transit Time** - How long a shipment takes, from the courier first handling it to final delivery.

###### W

* **Webhook** - A way for Ship24 to push tracking updates to your system as they happen, rather than you asking for them. See [setting up webhooks](https://help.ship24.com/en/article/setting-up-webhooks-for-the-tracking-api-1iaiqes/).
* **Webhook Secret** - A code sent with every webhook request so you can confirm it genuinely came from Ship24.
* **Webhook URL** - The address on your own system where Ship24 sends tracking updates.