A mechanism by which one system automatically sends data to another the moment a specified event occurs — an event-driven push delivering real-time updates, instead of the receiver repeatedly polling for changes.

How is a webhook different from an API call?

With polling, a system repeatedly asks an API 'has anything changed?'; a webhook flips this — the source pushes data the instant an event happens, so the receiver reacts in real time without asking.

Why do webhooks matter for growth?

They power real-time, event-driven automation: a purchase, cart abandonment, or milestone can instantly trigger an email, personalization, or workflow, making lifecycle marketing immediate rather than batched and late.

Growth Marketing Glossary

Webhook

web·hooknoun

An automatic push when something happens - a system notifies another the instant an event occurs, in real time, instead of being constantly asked. Event-driven, not polled.

Schematic — an event pushing data to another app

Term: Webhook
Is: An automatic event-triggered push of data
Triggers on: A specified event occurring
Versus polling: Real-time push, not repeated asking

Forms & parts of speech

webhook · noun

An event-triggered data push.

"A webhook fired the moment a purchase completed, instantly triggering the welcome flow."

Definition in plain terms

A webhook is a way for one system to automatically notify another the instant a specific event happens, by sending it a message with the relevant data. The contrast is with polling, where a system has to repeatedly ask another 'has anything changed yet?' over and over.

A webhook flips that around: instead of asking, the source system pushes the information the moment the event occurs - a purchase completes, a form is submitted, a payment fails - so the receiving system finds out in real time and can react immediately.

Webhooks are event-driven and efficient, avoiding the delay and wasted effort of constant polling.

They're widely used to connect tools and automate workflows: when something happens in one system, a webhook can instantly trigger an action in another, which is the backbone of real-time automation across a stack.

Why it matters to growth leaders

Webhooks are the mechanism behind much of the real-time automation that powers modern growth and lifecycle marketing.

When a customer takes an action - makes a purchase, abandons a cart, hits a usage milestone - a webhook can instantly notify the systems that need to respond, triggering a timely email, a personalization update, a CRM change, or a workflow, without delay.

This real-time responsiveness is what makes lifecycle and behavioral marketing feel immediate and relevant rather than batched and late.

For a growth leader, understanding webhooks (at least conceptually) clarifies how event-driven automation works and why it's so much more powerful than periodic syncs: the right message or action can fire the moment the triggering behavior happens.

It also helps in evaluating tools and scoping automations with engineering - knowing that webhooks enable real-time, event-based connections is part of designing growth systems that respond to customers instantly rather than on a delay.

Worked example. A growth leader wants the company's welcome and lifecycle flows to feel immediate - firing the moment a customer acts - but the current setup syncs data in periodic batches, so a new customer might wait hours before the welcome email arrives. Understanding webhooks provides the fix.

A webhook is an automatic push: instead of one system repeatedly polling another for changes, the source system sends data the instant a specified event occurs.

The growth leader works with engineering to set up webhooks so that the moment a purchase completes, a webhook fires and instantly triggers the welcome flow; the moment a cart is abandoned or a usage milestone is hit, the relevant system is notified in real time and responds immediately.

The batched delays disappear, and lifecycle marketing becomes genuinely event-driven - the right message firing exactly when the triggering behavior happens, which makes it feel timely and relevant rather than late.

Understanding webhooks as real-time, event-based pushes rather than periodic polling, the growth leader designs growth systems that respond to customers instantly, and evaluates tools on whether they support the webhooks that make immediate, behavior-triggered automation possible.

Failure modes to watch. Relying on periodic batch syncs where real-time webhooks would make automation immediate; confusing webhooks (event-driven push) with polling an API (repeated asking); not securing or validating incoming webhook data; and missing how event-driven triggers enable timely lifecycle marketing.

Synonyms & antonyms

Synonyms

webhookweb hookHTTP callback

Antonyms

pollingbatch sync

Origin & history

A webhook delivers an automatic, event-triggered push of data from one system to another in real time, replacing inefficient polling; it is the backbone of event-driven automation that lets growth systems respond to customer behavior instantly.

Etymology: source.

Usage trends

Search interest for this term over the last five years:

View interest-over-time on Google Trends →

Common questions

What is a webhook?: A mechanism by which one system automatically sends data to another the moment a specified event occurs — an event-driven push delivering real-time updates, instead of the receiver repeatedly polling for changes.
How is a webhook different from an API call?: With polling, a system repeatedly asks an API 'has anything changed?'; a webhook flips this — the source pushes data the instant an event happens, so the receiver reacts in real time without asking.
Why do webhooks matter for growth?: They power real-time, event-driven automation: a purchase, cart abandonment, or milestone can instantly trigger an email, personalization, or workflow, making lifecycle marketing immediate rather than batched and late.

Related tools & calculators

toolRGM benchmarks compendium

Resources & people to follow

referenceWikipedia — webhook
referenceMartech automation and growth practice
referenceRGM analysis — webhooks make lifecycle marketing event-driven; the right action fires the instant the behavior happens, not on a batch delay

Curated, non-competitor resources verified per term.

Related training

moduleMarketing analytics

Disciplines

Areas of marketing where webhook is a core concern:

AI searchGrowth strategy

Sources

trendsGoogle Trends — "webhook"