Reduce
Reduction of usage of material or commodity such as e.g electricity and water
Recycle
Recycle is sending back the used good to manufacturer to use the material to produce some other byproduct. e.g., plastic cups and buckets, glass tumbler, paper, metal objects
Reuse
Reuse is the repeated usage of the same material instead of throwing it out. e.g., used envelopes, plastic carry bags, bottles of jam.