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External input

External input is information or data originating outside the system, component, or context that consumes or processes it.

How 2 Manning books explain it

First-Party Data Activation

Customer or market data collected by an external entity without a direct relationship between the customer and the organization using it.

How it is used
Positions externally collected data as a cautious supplement for market context, reach, targeting, and enrichment rather than a first-party foundation.
How deep it goes
Defines the data type, compares its trade-offs, and gives purchasing checks without detailing technical integration.
Examples
Uses headphone ads after a search, shared-device profile errors, purchased marketing lists, and provider-selection criteria.
What you can do after
Evaluate/understand it by weighing added reach against data quality, matching, licensing, compliance, and customer trust.

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Apache Kafka in Action

Data on the outside is service-external data structured for exchange across service boundaries and independent of any one service's internal model.

How it is used
Supports service-to-service exchange through a service-agnostic data model.
How deep it goes
Defines coupling, immutability, and model independence, but does not specify a concrete schema or implementation.
Examples
Illustrates independent internal-model changes, service-boundary data exchange, and retained historical messages.
What you can do after
Evaluate service boundaries and choose decoupled exchange patterns alongside tightly coupled internal storage.

Read how Apache Kafka in Action explains external input →

Related concepts

These guides are generated from the text of Manning books by Manning's knowledge graph and link to the sections they draw on. The full books are available on liveBook and at manning.com.