> ## Documentation Index > Fetch the complete documentation index at: https://docs.lettr.com/llms.txt > Use this file to discover all available pages before exploring further. # Audience > Build and organize your Lettr audience, a team-wide pool of contacts you shape with lists, topics, properties, and segments for campaigns Your Audience is the database of people you send marketing email to from Lettr. It lives separately from your transactional sending: transactional emails go to recipients you specify per API call, while campaigns go to people you've already collected in your Audience. The Audience is a single, team-wide pool of contacts. You don't create multiple audiences — instead, you organize one pool using lists, topics, and segments, then point campaigns at whichever slice of the pool you want to reach. The entire audience pool, including its lists and segments, can also be managed programmatically. See the [Audience API](/api-reference/audience/list-audience-lists) to read and modify contacts, lists, topics, properties, and segments from your own application. The Audience feature is part of Lettr's marketing plan. Every account includes a free 500-contact tier; larger audiences require a paid marketing tier. See [Billing](/learn/settings/billing#marketing-plans) for tiers and pricing. ## Core Concepts The Audience feature is built around five entities. Understanding how they relate is the fastest way to get productive. | Concept | What it is | | ------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Contact** | One person in your audience, identified by email address. Has a status (subscribed, unsubscribed, bounced, complained, unverified) and any custom properties you choose to attach. | | **Property** | A named field you define once for your whole team (for example `first_name`, `plan`, `signed_up_at`). Every contact can have its own value for each property. | | **List** | A static, named group of contacts. You add and remove contacts yourself. A contact can belong to many lists. | | **Topic** | A subscription category contacts can opt in or out of (for example "Product Updates" or "Weekly Digest"). Lets recipients manage preferences at a finer grain than a single subscribe/unsubscribe toggle. | | **Segment** | A dynamic group defined by conditions (for example "subscribed contacts with `plan = pro` who signed up after January"). Segments re-evaluate themselves whenever contact data changes. | The individual records that make up your audience — statuses, properties, and the activity log Static groups for organizing contacts by purpose Subscription preferences contacts can opt in and out of Dynamic groups defined by conditions, with an AI segment builder Bulk-load contacts from CSV and export your audience Confirm new signups before they enter your audience ## How Audience and Campaigns Connect The Audience feature gives you the people. The [Campaigns](/learn/campaigns/introduction) feature gives you the way to email them. When you build a campaign, you choose its audience by selecting one of three options: 1. **All contacts** — every subscribed contact in your team 2. **One or more lists** — contacts who are members of any of the selected lists 3. **One or more segments** — contacts matching the conditions of any of the selected segments You can combine lists and segments in the same campaign. Contacts that appear in more than one source are sent the email exactly once. Campaigns only send to contacts whose status is **subscribed**. Contacts marked `unsubscribed`, `bounced`, `complained`, or `unverified` are skipped automatically. You don't have to manage suppression yourself. ## Getting Started Before importing or adding contacts, set up the [properties](/learn/audience/contacts#custom-properties) you want to track — names, plans, signup dates, anything you'll want to personalize emails by or filter on later. Adding properties first means imports can populate them from day one. Add contacts manually from the dashboard, [import them from a CSV](/learn/audience/importing-and-exporting), or create them via the API (with optional [double opt-in](/learn/audience/double-opt-in)). Group contacts manually using [lists](/learn/audience/lists), let recipients pick their own preferences using [topics](/learn/audience/topics), and create [segments](/learn/audience/segments) to target slices of your audience dynamically. Head to [Campaigns](/learn/campaigns/introduction) and create your first campaign. Pick which lists or segments to target, design your content, and send. ## What's Next Learn how contacts work and start adding them Use your audience to send a marketing email