When you create a trigger for VWO, the Made with Intent client script will tell VWO to execute a campaign by its ID at the point at which the segment matches. It's doing this behind the scenes:
window.VWO.push([
'activate', false, VWO_CAMPAIGN_ID, true
]);
and this fires every time the trigger and campaign conditions are met.
How to create an experience in VWO
Configure your VWO campaign as normal
Enable Manual Campaign Activation in your VWO campaign settings
Copy the VWO Campaign ID (e.g. 340) into the trigger modal under VWO Campaign ID
Click save