Quick definition · 2 min Internet & web term
Webhook
A webhook is an automatic message one app sends another the instant something happens, so nothing has to keep checking.
Think of it like
A doorbell instead of looking out the window every minute. The event rings you the moment it occurs.
Example
When someone pays, a webhook instantly tells your app, which then emails the receipt, no checking required.
Why it matters
Webhooks are the glue of automation. They are how tools and AI agents react to events in real time.
Where you’ll see it
StripeGitHubZapier