Northern trail Outfitters is hiring a third-party vendor to host a web page tied to...

When a subscriber submits a form on a third-party vendor'sweb page, Salesforce Marketing Cloud provides a way to enter that subscriber into a journey through the API Event Entry Source. This entry source allows external systems to trigger a journey by making an API call to Marketing Cloud. The API Event is designed to accept data from external sources and initiate the journey, ensuring immediate response to the form submission.

References:

Salesforce Marketing Cloud Documentation on API Event Entry Source