what is universe

The universe is a big, big, slice of cosmic cake.

But then something has to be bigger than that cosmic cake

But we are 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it

Universe is the space (space not being defined here since we don't know if space exists beyond the edges of the universe) originated from the singularity, which is comprised of galaxies, according to the leading theory of the Big Bang.

the universe is the space that we are confined in (or not confined in), it is referring to space time as in - we are existing in space time. this means that everything is in, and is space. including earth, and everything In and out of it

But space doesnt exist

When you refer to space, what are you referring to? Like, as in the place of space, or as in of space time, or any type of other matter?