“What is Daas Torah?”
I believe Daas Torah refers to the Torah’s view on a given issue. I also believe that the Torah has a view on every issue, whether it is a matter of halacha, hashkafa, chinuch, career, relationships, etc.
“Let’s say you ask a Gadol or a Rav…so that’s Daas Torah right?”
Here’s what I look for when seeking out someone who has Daas Torah: Someone who has spent years completely immersed in learning, completely detached from gashmiyus and secular influences, to the point where they breathe Torah 24/7. Their vision is pure and their sole motive is ratzon Hashem. They are an expert in mussar and hashkafa. They are so absorbed in Torah, that their daas is Daas Torah.
“Does that mean if you would have asked another Rav/Gadol they would have said the same thing?”
If you are lucky enough to have someone who you believe has Daas Torah, then it really doesn’t matter if another Rav would have said the same thing. As far as you’re concerned, you did what Hashem wants you to do- you sought the advice of Daas Torah. Nobody else’s opinion matters. The trick is to find that someone who you feel 100% comfortable having them make big-deal decisions for you because you believe that their advice comes from Torah.
One more point: Generally, advice from a mechanech comes from wisdom born of experience and is not necessarily Daas Torah. There is nothing wrong with seeking advice of an experienced mechanech on a chinuch related issue. There is also nothing wrong with seeking the advice of an experienced shidduch mentor on a shidduch related issue. But experience is not enough when it comes to critical decisions which will significantly impact our life. When the consequences are serious, you want Daas Torah behind you, not just experience.