Kindly explain in details, What are peroxides and superoxides? How they differ from each other and also from monoxide ..?

Dear student

These are the different compounds of oxygen where O is found to be in different oxidation states. Like in the peroxides, there are two oxygens attached by single bond and have an oxidation state of -2. 
Peroxides are O₂^2-
Superoxides are two oxygens O₂^- but having just one negative charge so each oxygen shares just 0.5 negative charge. 
in monooxides each individual oxygen atom has -2 charge and is O^2-

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