title:'Spec: Signals'

This page is a guide for developers who want to track events with Segment's Auto-Instrumentation. It explains structure and definition of Signals.

This is a guide for developers who want to track events with Segment's Auto-Instrumentation. It explains the structure and definitions of Signals.

Signals provides automated user activity tracking through a sophisticated breadcrumb system. It captures crucial user interactions and allows you to transform them into meaningful analytics events using JavaScript.

Signals provide automated user activity tracking through a sophisticated breadcrumb system. They capture crucial user interactions and allows you to transform them into meaningful analytics events using JavaScript.

-**Comprehensive Activity Tracking**

- User interface interactions

- Network activity monitoring (inbound/outbound)

- Network activity monitoring (inbound andoutbound)

- Local data access patterns

- Integration with existing analytics events

-**Enterprise-Grade Privacy**

- Create custom event generation rules

- Process and filter data in real-time

There are 6 different types of Signals:

-**Interaction Signal** - Captures user interactions with interface elements such as clicks, form submissions, and input changes

-**Navigation Signal** - Tracks navigation events and screen/page transitions in web and mobile applications

-**Network Signal** - Monitors HTTP requests and responses, including API calls and data fetching operations

-**Local Data Signal** - Records local data storage operations like creating, reading, updating, or deleting data

-**Instrumentation Signal** - Captures existing analytics events and instrumentation data from Segment Analytics

-**User DefinedSignal** - Allows for custom signal types with application-specific data and properties

-**Interaction Signal** - Captures user interactions with interface elements such as clicks, form submissions, and input changes.

-**Navigation Signal** - Tracks navigation events and[Screen](/docs/connections/spec/screen) or[Page](/docs/connections/spec/page) transitions in web and mobile applications.

-**Network Signal** - Monitors HTTP requests and responses, including API calls and data fetching operations.

-**Local Data Signal** - Records local data storage operations like creating, reading, updating, or deleting data.

-**Instrumentation Signal** - Captures existing analytics events and instrumentation data from Segment Analytics.

-**User-definedSignal** - Allows for custom signal types with application-specific data and properties.

All signals include these base properties:

}

The`Context` type is defined asfollow:

The`Context` type is defined asfollows:

| Property| Type| Description|

|----------|------|-------------|

}

Web signals include additional page context:

}

Capture user interactions with interface elements.

Interaction signals capture user interactions with interface elements.

}

Track navigation and screen changes.

Navigation signals track navigation and screen changes.

}

Monitor network requests and responses.

Network signals monitor network requests and responses.

| Property| Type| Description|

|----------|------|-------------|

}

Track local data storage operations.

}

Capture analytics events and instrumentation data.

Instrumentation signals capture analytics events and instrumentation data.

| Property| Type| Description|

|----------|------|-------------|

}

Allow for custom signal types with arbitrary data.

User-defined signals allow for custom signal types with arbitrary data.

| Property| Type| Description|

|----------|------|-------------|

"userId":"user-12345",

"confidence":0.85

}