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Questions asked by users might not always be phrased in the clearest way.
Diastereoisomers are stereoisomers that are not enantiomers. This means they are non-superimposable mirror images of each other. They have different physical and chemical properties.
Example:
Consider the compound 2,3-dichlorobutane. It has two chiral centers, and therefore, four possible stereoisomers. Two of these stereoisomers are enantiomers, while the other two are diastereomers. The diastereomers have different melting points and boiling points due to their distinct spatial arrangement.
[Image of 2,3-dichlorobutane stereoisomers would be helpful here, but I cannot display images.]