Ask him if he is talking about the Clouds ie.(Gaseous Air) or as in the Tech Platform. Gaseous Air:- Well understand one thing, a lot many things in this world are redundant only in the eyes of normal people. You want to sell clouds, well then figure out who is your target customer-in need? 1. People in Deserts may need some rain shower. 2. Farmers may need some rain shower. 3. Make up a hypothetical tech piece and tell the interviewer that this machine purifies gases from industries and helps create moisture in the air, which eventually leads to Precipitation..yada yada yada... 4. PM Modi might need clouds to hide his Rafale under them and skip every opposition radar, like Nick Fury in The Avengers did with his SHIELD retro-reflective panels, maybe. (Don't say that, it might be possible that he could be a right winger) Cloud (As in Tech) 1. Digital Marketing works fine. 2. Corporate Seminars , Campaigns, Apps, Ads, yada yada yada, etc. 3. The metropolitian people know about this, outskirts and new cities can be a great place to start. 4. Colleges for students.