---
title: Glossary
description: Definitions of key terms used in the Cloudflare Workflows documentation.
image: https://developers.cloudflare.com/dev-products-preview.png
---

> Documentation Index  
> Fetch the complete documentation index at: https://developers.cloudflare.com/workflows/llms.txt  
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# Glossary

Review the definitions for terms used across Cloudflare's Workflows documentation.

| Term              | Definition                                                                                                                                                                                                                                                                                                                                                               |
| ----------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| Durable Execution | "Durable Execution" is a programming model that allows applications to execute reliably, automatically persist state, retry, and be resistant to errors caused by API, network or even machine/infrastructure failures. Cloudflare Workflows provide a way to build and deploy applications that align with this model.                                                  |
| Event             | The event that triggered the Workflow instance. A WorkflowEvent may contain optional parameters (data) that a Workflow can operate on.                                                                                                                                                                                                                                   |
| instance          | A specific instance (running, paused, errored) of a Workflow. A Workflow can have a potentially infinite number of instances.                                                                                                                                                                                                                                            |
| step              | A step is self-contained, individually retryable component of a Workflow. Steps may emit (optional) state that allows a Workflow to persist and continue from that step, even if a Workflow fails due to a network or infrastructure issue. A Workflow can have one or more steps up to the [step limit](https://developers.cloudflare.com/workflows/reference/limits/). |
| Workflow          | The named Workflow definition, associated with a single Workers script.                                                                                                                                                                                                                                                                                                  |

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