# Letterhead Glossary

## Not sure what something means? This glossary breaks down common terms you’ll see in the Help Center.

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| --- | --- |
| Letterhead | Letterhead is the name of our platform. A newsletter creation and distribution tool that helps you build, manage, and grow email newsletters with ease. **[Learn more!](https://letterhead.ai/use-cases?hsLang=en)** |
| Advertiser | An external party (a business, brand, or sponsor) that **pays to place an ad or promotion in your newsletter**. They are not part of your organization—they're buying visibility from you. |
| Auto-inject | Auto-Inject is a feature for promotions that **automatically places a promotion in a specific section** of your newsletter, such as the header, hero, mid-body, bottom-body, or footer based on the placement selected at promotion creation. Instead of manually dragging a promotion block, the system injects it for you when the promotion date is selected in Step 2 of the newsletter creation. Auto-injected promotions are **locked in place to prevent accidental changes,** which is especially useful when specific placement has been promised to an advertiser. |
| Audience | Your audience is the **full list of contacts, regardless of their status**, such as subscribed, unsubscribed, pending confirmation, pending disengaged, disengaged, cleaned, or not subscribed. |
| Block | A block is a **content section you add in the composer** when building a newsletter. Each block can include different types of content, such as text, images, links, articles, or promotions. |
| Company | A company is your **dedicated workspace within Letterhead.** Each company has its own organizations and channels. Your company is **accessed via a unique URL**, like `yourcompanyprefix.app.tryletterhead.com`. |
| Composer | Letterhead's **tool for creating and scheduling** newsletters. |
| Channel | A channel is where you **create and manage individual newsletters**. Each channel has its own settings, content, audience, and send schedule. Channels can be customized independently, but they also inherit certain settings from the organization level. |
| Curator | The person **responsible for selecting and organizing the content** that goes into a newsletter. |
| Curations Library | The Curations Library is where **saved articles are stored for future use** in your newsletters. These articles **can be added through the browser extension, API, RSS feeds, or other integrations,** making it easy to reuse and organize content across issues. |
| Default Promotion Type | The common **[promotion types](https://help.tryletterhead.com/what-are-promotion-types?hsLang=en)** that are serviced by Letterhead. |
| Email Subject | The subject line is the **main title of your email, shown in your audience's inbox**. It's one of the first things recipients see and plays a **key role in encouraging them to open** the newsletter. |
| Newsletter | A newsletter is a **curated email sent to your audience** on a regular schedule. It can include articles, announcements, promotions, links, and other content. |
| Organization | An organization (also called a _brand_) is the top-level account where you **manage global settings, create promotions, and view data across all channels**. Settings made at the organization level apply to all channels under it unless overridden. It gives you a centralized overview of your entire newsletter operation. |
| Prefix | The **unique identifier that appears at the beginning of your company’s URL** in Letterhead. You will receive this from support when joining Letterhead. For example, in `yourcompanyprefix.app.tryletterhead.com` |
| Preview Text | Preview text **appears next to or below the subject line in the inbox.** It gives recipients a **short summary or teaser of what’s inside the newsletter,** and can help boost open rates when written effectively. |
| Promotions | Promotions are **paid, sponsored content that appear within your newsletter** and are used to promote products, services, events, or other offerings to your audience. |
| Promotion Type | A **unique structure for a promotion**; each promotion type carries properties, for example, a banner promotion type includes a 728x90px image and a link. |
| Sending | A status that indicates the newsletter is still in the process of being delivered. If it's marked as "Sending," it means **fewer than 75% of recipients have confirmed delivery** so far. |
| Scheduling | "Scheduling" is an unofficial status that appears when a **newsletter reaches Step 2 in the send flow but is never fully scheduled.** It acts as a warning that the issue is in progress but hasn't been assigned a send date or time. |
| Spam Complaint | A spam complaint occurs when a recipient **reports your email as unwanted or spam,** typically by clicking the "Report Spam" or "Junk" button in their email client. |
| Templates | A newsletter template is a **reusable layout that includes pre-arranged content blocks** to help you quickly set up a newsletter. Use templates to save time and maintain consistency.