What is gravity? (no fancy answers please)
I think we need to figure that out so we can go into space. So, (while I don't want to open an argument I had previously), I don't think we will ever get anyplace much with rocket propulsion, and we need to figure out some other mode.
We don't know. Our level of science has several potential answers/suggestions, the two most prominent being Newton's and Einstein's.
Newton says that Gravity is a Force. Einstein says that Gravity is a geometry.
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There is no such thing as gravity...the earth sucks. (Old skydiving joke, sorry)