# pub/sub

CEFR C1 · Noun

Source: https://englishreference.com/word/pub-sub
Updated: 2026-07-22

## Definition

a way for computer programs to send messages to each other without being directly connected. One program 'publishes' information, and any other program that has 'subscribed' to that topic receives it automatically.

For teachers: a messaging pattern where senders (publishers) do not program the messages to be sent directly to specific receivers (subscribers). Instead, messages are categorized into classes or topics, allowing for greater scalability and looser coupling between software components.

## Examples

- The application uses a pub/sub model to handle real-time notifications.
- By implementing pub/sub, the weather service can broadcast updates to thousands of users simultaneously.
- The architecture leverages a pub/sub pattern to decouple microservices, allowing the analytics engine to process data streams without impacting the primary database.

## Usage notes

- Often functions as a compound noun or a modifier before another noun (e.g., 'pub/sub model', 'pub/sub system').

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.