What was Agent Orange?

Agent Orange was a herbicide developed for military use. Chemically, the product was a 50/50 mix of two herbicides, 2,4,-D (2,4, dichlorophenoxyacetic acid) and 2,4,5-T (2,4,5 trichlorophenoxyacetic acid). These herbicides were both developed as weed killers in the 1940's, and were effective against broad leaf plants and several crops.