Mounts are a feature of Heroes of the Storm. They are used by heroes for extra speed. Heroes cannot attack or cast abilities while mounted.
Heroes are able to ride into battle on a mount, allowing quick returns to a fight and great mobility from one lane to another. Mounts replace boots. They have a two second channel time and allow heroes to move around faster. While mounted, when a hero is hit by any source of damage, they are dismounted. After dismounting, it takes a few seconds before a hero can mount again.
Most mounts include different skins. All players start with a free horse mount, and most additional mounts can be "crafted" via the Collection interface using shards. Prices range from 100 to 1600. In addition, unique mounts are also given as a reward to players who make a real money purchase; these "billy goats" are different depending on when a player made the purchase.
Some heroes don't have a mount, either due to physiology (e.g. Zagara) or abilities that have similar benefits (e.g. Brightwing's teleportation ability).