Unicorns

Unicorn ponies, or simply unicorns as they are called in the show, are one of three types of ponies living in Equestria, characterized by their horns and their ability to perform magic.

Physical traits
As the name suggests, all unicorns have a long horn protruding from their forehead, which glows when their magical powers are used. Generally, unicorns are not as strong as Earth ponies. Although they are associated with their magic, a unicorn's horn is strong and sharp enough to have mundane uses. One unicorn in Call of the Cutie uses it to pop balloons, and Twilight Sparkle uses it to charge an opponent on several occasions. Twilight Sparkle and Rarity are often seen using their intellects to compensate for their lack of physical strength, such as when Twilight earns fifth place in the Running of the Leaves in Fall Weather Friends and Rarity overcomes her captors in A Dog and Pony Show.

Unicorns are noticibly more aristocratic than the other pony races. Before the founding of Equestria, the unicorn tribe was made up of royals, nobles, and magicians, as opposed to the farms earth ponies, and the warrior pegasi. Modernday Canterlot features an overhwelming population of upper-class ponies who are for the majority, unicorns. Rarity is a notable example of the natural inclination toward the finer things in life, preferring fancy clothes, etiquette, and decorum.

Unicorn magic

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Appearances
Canterlot appears to be a unicorn city in its brief appearance, populated mostly by unicorns, with notable exceptions being Hoity Toity and Celestia's Pegasus pony guards. Ponyville has its share of unicorns, but unicorns are only seen as waiters in Applejack's visit to Manehattan. Since they lack the natural ability to walk on clouds, they are not ordinarily present in Cloudsdale.