>Knock | Customer engagement infrastructure

# Knock ## Knock is the category leader in infrastructure for sending product and customer messaging. Ship cross-channel product notifications and lifecycle messaging that drive engagement, growth, and retention. ## Product ### Features - [Workflows](/features/workflows): Orchestrate your entire customer journey. A single workflow engine for powering transactional and lifecycle messaging across every channel. - [Guides](/features/guides): In-app messaging with your own components. Ship paywalls, dialogs, and nudges powered by your components. Enable non-engineers to edit copy and targeting in Knock. - [Broadcasts](/features/broadcasts): Intelligent, multi-channel announcements. Send one-time announcements across every channel, with complete control over audience, content, and delivery. - [Agents](/features/agents): Autonomous customer engagement. The only customer engagement platform you can work with entirely using natural language. - [Observability](/features/observability): Complete visibility into your notifications - [Template management](/features/template-management): A single place to manage your notifications - [Preferences](/features/preferences): Notify on the right channel at the right time ### Channels - [In-app](/channels/in-app-notifications): Deliver notifications with our in-app channel - [SlackKit](/channels/slackkit): Notifications where your customers work and talk - [Email](/channels/email): Make sending email from your product effortless - [Mobile](/channels/mobile): Easily add mobile notifications to any app - [More](/integrations): See all available channels -> ## Developer ### Getting Started - [Documentation](https://docs.knock.app): Learn key concepts and integrate Knock - [Knock CLI](/cli): Bring Knock to your terminal - [Quick start](https://docs.knock.app/getting-started/quick-start): Send your first notification with Knock - [Tutorials](https://docs.knock.app/guides/alerting): How to power common use cases ### Resources - [API r