Dumpster diving by definition is a modern way of rescuing waste from big supermarkets, residential, and the like. Commonly, the items that have been thrown away by the sellers or owners and these are being salvaged by other people for the purpose of reusing it.
As cliché as it sounds —it is truly finding treasure in someone else’s trash. It is the act of retrieving items that can still be repaired and reused by the others.
Even a mass of food can be found in a dumpster. Majority of it are even not yet expired and are still completely safe for eating. This is as long as the packs or containers are still intact and the food itself are still edible. If you are lucky enough, you will find real money in the bins you’ve dived in, gadgets that are still functional, and even real guns.
See video below to see it for yourself: