A pre-frame bridge is used to warm up people to get the kind of action you want them to take through the sales funnel. The pre-frame basically educates them about the problem or the solution so that the person is warmed up and ready to buy what you sell.

https://podcasters.spotify.com/pod/show/mlmtrigger/episodes/Sales-Qualifying-Questions-To-Identify-Prospects-e20kpdv