In this mode, Hoverfly uses traffic captured using Capture mode (which may also have been manually edited) to mimic external APIs.
Each time Hoverfly receives a request from the application, instead of forwarding it to the intended destination, Hoverfly will resolve it. First it will look in a cache which is populated with requests and responses that it has served previously. If Hoverfly finds a matching request in the cache, it will serve the associated response.
If a matching request is not found in the cache, Hoverfly will look for a matching request within the simulation.