name: Customer.io Vocabulary
description: >-
  Controlled vocabulary describing the core concepts of the Customer.io APIs (Track,
  App, and Pipelines), including people/customers, events, devices, segments, broadcasts,
  campaigns, newsletters, transactional messages, and reporting webhooks.
modified: '2026-04-28'
terms:
  - term: Customer
    description: A person identified inside Customer.io with a stable id, traits, and timestamps.
  - term: Event
    description: A behavioral event tracked against a customer, with name, timestamp, and data payload.
  - term: Device
    description: A push-capable device (iOS or Android) registered against a customer.
  - term: Segment
    description: A static or dynamic group of customers used for targeting messages and campaigns.
  - term: Campaign
    description: A multi-step, trigger-based automated message workflow.
  - term: Broadcast
    description: A one-time message sent to a static or filtered audience.
  - term: Newsletter
    description: A scheduled email sent to a defined audience.
  - term: TransactionalMessage
    description: A message triggered by an application event and sent to an individual customer.
  - term: Workspace
    description: An isolated Customer.io environment containing customers, events, and configuration.
  - term: ReportingWebhook
    description: An outbound webhook that delivers message lifecycle events (delivered, opened, clicked, bounced, etc.).
  - term: PipelinesCall
    description: A Segment-spec data ingestion call - identify, track, page, screen, group, or alias.