Glossary (21)

Last updated Apr 23, 2026 Review the definitions for terms used across Cloudflare's Workers documentation.

Term Definition
Auxiliary Worker A Worker created locally via the Workers Vitest integration that runs in a separate isolate to the test runner, with a different global scope.
binding Bindings allow your Workers to interact with resources on the Cloudflare Developer Platform.
C3 C3 is a command-line tool designed to help you set up and deploy new applications to Cloudflare.
CPU time CPU time is the amount of time the central processing unit (CPU) actually spends doing work, during a given request.
Cron Triggers Cron Triggers allow users to map a cron expression to a Worker using a scheduled() handler that enables Workers to be executed on a schedule.
D1 D1 is Cloudflare's native serverless database.
deployment Deployments track the version(s) of your Worker that are actively serving traffic.
Durable Objects Durable Objects is a globally distributed coordination API with strongly consistent storage.
duration Duration is a measurement of wall-clock time — the total amount of time from the start to end of an invocation of a Worker.
environment Environments allow you to deploy the same Worker application with different configuration for each environment. Only available for use with a Wrangler configuration file.
environment variable Environment variables are a type of binding that allow you to attach text strings or JSON values to your Worker.
handler Handlers are methods on Workers that can receive and process external inputs, and can be invoked from outside your Worker.
isolate Isolates are lightweight contexts that provide your code with variables it can access and a safe environment to be executed within.
KV Workers KV is Cloudflare's key-value data storage.
module Worker Refers to a Worker written in module syntax.
origin Origin generally refers to the web server behind Cloudflare where your application is hosted.
Pages Cloudflare Pages is Cloudflare's product offering for building and deploying full-stack applications.
Queues Queues integrates with Cloudflare Workers and enables you to build applications that can guarantee delivery.
R2 R2 is an S3-compatible distributed object storage designed to eliminate the obstacles of sharing data across clouds.
rollback Rollbacks are a way to deploy an older deployment to the Cloudflare global network.
secret Secrets are a type of binding that allow you to attach encrypted text values to your Worker.
service Worker Refers to a Worker written in service worker syntax.
subrequest A subrequest is any request that a Worker makes to either Internet resources using the Fetch API or requests to other Cloudflare services like R2, KV, or D1.
Tail Worker A Tail Worker receives information about the execution of other Workers (known as producer Workers), such as HTTP statuses, data passed to console.log() or uncaught exceptions.
V8 Chrome V8 is a JavaScript engine, which means that it executes JavaScript code.
version A version is defined by the state of code as well as the state of configuration in a Worker's Wrangler file.
wall-clock time Wall-clock time is the total amount of time from the start to end of an invocation of a Worker.
workerd workerd is a JavaScript / Wasm server runtime based on the same code that powers Cloudflare Workers.
Wrangler Wrangler is the Cloudflare Developer Platform command-line interface (CLI) that allows you to manage projects, such as Workers, created from the Cloudflare Developer Platform product offering.
wrangler.toml / wrangler.json / wrangler.jsonc The configuration used to customize the development and deployment setup for a Worker or a Pages Function.

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