Delta 8 is a type of THC (the main psychoactive compound in cannabis). It's chemically different from Delta 9 THC (the most abundant form of THC in cannabis) by only a few atomic bonds. Delta 8 is known for producing milder psychoactive effects than Delta 9 THC. It is often marketed in various forms like edibles, oils, and vapes, and is subject to a complex legal status in various regions, due to its similarities with Delta 9 THC.