This is a dog, you can use bones to tame them, they will attack whatever you attack once tamed.
This is a cat, they are only found in villages, and you use fish to tame them, they scare off creepers.
This is a donkey, you can ride them.
This is a fox, it can be found in forest biomes, you can only tame them if you breed them then the child becomes tamed.
This is a goat, it can be found in mountains, and can headbut you.
This is a horse, you can ride them and breed them with hay.
This is a llama, they spit at you and give you fish when you kill them.
This is a mooshroom, they are rare, and if you shear them they give you mushrooms.
This is a mule, it is a variation of a horse and donkey.
This is an ocelot, they are found in jungle biomes and can be fed fish, they don't transfer into cats.
This is a panda, they are found in bamboo biomes, and can be fed bamboo.
This is a pig, it is one of the main animals that gets bred for food.
This is a polar bear, they are found in ice biomes, and when you kill them they drop fish.
This is a rabbit, they are often found in desert/sahara biomes, and can drop a rabbits foot.
This is a sheep. This is another main farm animal, since it drops food, and gives wool for builds and to be able to sleep, which is needed.
This is a trader llama, they come with the minecraft trader who wanders around selling useful items.
This is a trader, they wander around selling useful items.
This is a villager. They live in villages, where you can trade for items, but they are largely considered the other humans in the game.
This is a bat, they are found in caves, and do nothing but fly around.
This is a bee, they make honey which you can harvest to drink or craft with.
This is a chicken, they drop feathers and chicken, which you can use to eat and craft, and they are a main farm animal.
This is a cow, they are a main farm animal. This is because they drop food, and leather which can be used to make armour.
Underwater:
These are axoltls, they live deep underwater and are hard to get, but they are often collected.
This is a dolphin. They are in oceans, and when swimming if one brushes up against you it makes you swim faster.
This is a glow squid. They live in deep caves or ravines, and they are light up, able be to used to light other things up as well.
This is a salmon. They are also a very common food source, and you can breed cats with them.
This is a squid, with the inc from a squid you can craft lots of items.
This is a tropical fish, they spawn only in tropical biomes and can be used to breed axoltls.
This is tuna, they are very commmon in oceans and are also a very common food source.
This is a turtle, if you hatch a turtle from a baby it gives you a turtle shell which you can use to breathe underwater for a bit longer.
Unfriendly animals:
On land:
This is a blaze, they are found in the nether, and when you kill them you get a blaze rod which is a key part of getting to the end.
This is a brute, they are spawned in the nether in a place called the bastian, which is filled with gold and enchanted items, which are all very useful.
This is a cave spider, they are usually spawned in mineshafts in spawners.
This is a creeper, they are created every night and don't die in daylight, but blow up when you go near them
This is an enderman, when killing them they drop an enderpearl which you need to go to the end, but they also kill anyone that tries to attack them very easily.
This is an endermite, they live in the end city on the way to the elytra.
This is a ghast, they live in the nether and shoot fireballs.
This is a hoglin, they live in the nether and attack anything near them no matter what it is.
This is a husk, it is a zombie dried out in the desert.
This is a magma cube, they live in the nether and can walk on lava.
This is a phantom, they spawn after you don't sleep for three nights and will continuously attack you unless you are inside or the sun rises and they die.
This is a pigling, if you are not wearing gold they will attack you but if you are you can trade with them to go further in the game.
This is a shulker. It is in the end city to prevent you from getting to the elytra.
This is a skeleton, they only spawn if a horse gets struck by lightening.
This is a skeleton, they spawn at night and die in the day, they shoot a bow and arrow.
This is a slime, it will attack you no matter what and often lives in swamps, but is useful for creations.
This is a spider, they spawn everywhere and will only attack durirng the night.
This is a witch, they live in huts but can spawn, and they shoot potions to kill.
This is a wither skeleton, it lives in the nether and gives poison and a lot of damage to anyone it touches.
This is a zombie horse, they are a horse that is a zombie.
This is a zombie pigman, they are harmless unless you hit them, then every single zombie pigman will try to kill you.
This is a zombie, they spawn at nights and die during the day, they are very slow and drop rotten flesh when killed.
Underwater:
This is a drowned, they are zombies that were left in the water too long, sometimes they will change into a drowned with a trident which can shoot at you.
This is a guardian, they protect the underwater temple.
This is a pufferfish, it doesn't attack you unless placed, and it poisons you.
This is an underwater guardian, it protects the underwater temple.