A Snowball can be obtained by shoveling Snow, breaking Snow Blocks or killing Snow Golems. Snowballs can be placed in stacks of 16. They can be thrown but do not harm any Mobs except Enderman and Blazes. Snowballs are able to knock back Mobs too. They can be crafted into Snow Blocks using 4 Snowballs.
It can be collected by any shovel.
Like Arrows and Chicken eggs, Snowballs can be fired from Dispensers.
Snowballs are the projectile of Snow Golems, offering a very minimal effect on other Mobs. Around 40 hits will kill a Zombie for example. They deal optimal damage against Nether mobs.