Mobs are creatures that spawn throughout maps. Unfortunately, Pocket edition only has two types of mobs. There are passive and hostile mobs. Passive mobs are friendly mobs that you can kill to get helpful supplies. Hostile mobs are mobs that will attack you and also drop supplies. As of now, MCPE only has 4 hostile mobs which are creepers, spiders, skeletons, and zombies. There are also only 4 passive which are shepp, pigs, cows and chickens.