You’ve got several points of confusion. Your original question made it seem like you meant the Personal Statement and general supp questions every Yale applicant answers. Now, you’re talking about a specific engineering prompt. It asks about the engineering program and you really should answer to that.
Many kids have zero idea what engineering does. They “want” to explore it. You have to ask yourself if that makes one competitive for the program. It’s easy to filter out kids who don’t have the range of experiences that can be expected at hs age, when it’s a tippy top college.
It’s a “qualifying” question, meaning, you stated major XX, what understanding and background? It’s a chance to show you know what you’re aiming for, have somewhat tested this interest, taken on appropriate challenges. And, for engineering, that you have the mindset and a few other traits. In that respect, it’s also a test of your general thinking.
So, how could you answer that prompt? How do you present yourself as qualified and compelling for EE and CS? Other than “I would like to…?” There’s a broad range of decent answers, but should be some basis.