CBD edibles are made from one of three distinct types of CBD. Full-spectrum CBD products contain all of the compounds (such as terpenes) found within the cannabis plant, including trace amounts of THC. Broad-spectrum CBD products contain all compounds but have had the THC removed. CBD isolate products consist of nothing except CBD (so no terpenes or cannabinoids).
Apart from CBD, many edibles also contain pectin / gelatine, sweeteners, oils, and artificial flavourings.