Webhook
A webhook is an automated HTTP callback that sends real-time data from one application to another when a specific event occurs.
A webhook is a way for one application to send real-time data to another application the moment something happens. Instead of constantly checking for updates (polling), the source system pushes data to a destination URL automatically when a specific event fires — like a form submission, deal stage change, or payment completion.
Webhooks matter in GTM operations because they are the connective tissue between your tech stack. When a prospect fills out a demo request form, a webhook can instantly notify your CRM, trigger a Slack alert to the sales team, add the contact to a nurture sequence, and update your analytics dashboard — all in real time, without manual intervention.
The difference between webhooks and API polling is timing and efficiency. Polling means your system checks every few minutes: “Any new data? Any new data? Any new data?” Webhooks flip this — the source system says “something just happened, here’s the data.” This makes webhooks faster and less resource-intensive.
For example, when a target account visits your pricing page, a webhook from your website tracking tool can instantly send that event to your sales engagement platform, triggering the assigned rep to get a real-time alert. The speed difference between a webhook-triggered notification and a batch sync that runs every hour could mean the difference between catching a buyer while they are actively evaluating or missing the window entirely.
Most modern GTM tools support webhooks natively. Integrations platforms make it straightforward to configure webhook connections between tools even when custom endpoints are needed.