What information is provided by showing a molecule's stereochemistry?

3-D shape of molecule and adjacent carbon atoms and their orientation.

Explanation:

Stereochemistry involves study of relative spatial positioning or arrangement of atoms which form structure of the molecules.

Stereochemistry studies focuses on the stereoisomers, which are the species which have same molecular formula but the sequence of the bonded atoms is different in the 3-D space of the atoms.

Thus,

Molecule's stereochemistry tells the 3-D shape of molecule and adjacent carbon atoms and their orientation.