Due to the game cutting off descriptions, you can read them in their full glory here!
Argonians (in their native tongue of Jel they call themselves the Saxhleel, or People of the Root) are the reptilian natives of Black Marsh, a vast swampland province in southeastern Tamriel. The other races often prefer to refer to them as ‘lizards’ or the ‘Lizard Folk’ instead, especially when meaning to be derogative. They are known as the foremost experts in guerrilla warfare throughout the Starry Heart, a reputation brought upon them by defending their borders from enemies for countless centuries. Argonians have a lifespan similar to that of humans.
The Bosmer are the Elven clan-folk of Valenwood, a forested province in southwestern Tamriel. In the Empire, they are often referred to as Wood Elves, but Bosmer, Boiche, or the Tree-Sap people is what they call themselves. Bosmer rejected the stiff, formal traditions of Aldmeri high culture, preferring a more romantic, simple existence in harmony with the land and its wild beauty and creatures. They are relatively nimble and quick in body compared to their more “civilized” Altmeri cousins. Their agility makes them well-suited as scouts and thieves. Bosmer live two to three times as long as humans; with a 200-year-old Bosmer being old and a 300-year-old Bosmer being very, very old.
The Altmer, or self-titled “Cultured People”, are a tall, golden-skinned race, hailing from Summerset Isle. They live two to three times as long as humans, sometimes reaching 300 years of age. They consider themselves the most civilised culture of Tamriel, and are the most strongly gifted race in mastering the arcane arts.
Bretons are the human descendants of the Aldmeri-Nedic Manmer of the Merethic Era and are now the inhabitants of the province of High Rock. They are united in culture and language, even though they are divided politically, for High Rock is a fractious region. Bretons make up the peasantry, soldiery, and magical elite of the feudal kingdoms that compete for power. Many are capable mages with innate resistance to magicka. They are known for a proficiency in abstract thinking and unique customs. Bretons appear, by and large, much like other pale-skinned humans. They are usually slight of build and not as muscular as Nords or Redguards.
The Dunmer, known in the Empire as Dark Elves, are the ash-skinned, typically red-eyed elven race of Morrowind. Like the Altmer, they can live two to three times as long as the human races. Masters in the art of destruction magic, their combination of powerful intellects with strong and agile physiques produces superior warriors and sorcerers. Often seen as proud, ruthless and cruel from the outside, the Dunmer greatly value loyalty and family.
Natives of the cosmopolitan province of Cyrodiil, the Imperials are some of the most well-educated, wealthy and well-spoken of the races in Tamriel. Imperials are also known for their discipline and training of their citizen armies. Because of this, the Imperials have dominated Tamriel for more than 2,000 years.
The Khajiit are a proud feline people that hail from Elwesyr. they are often mistreated and made slaves by the other races as most others only see them as petty criminals and thieves. Due to their many skooma operations around the other provinces, the Khajiit are often mistreated and looked down upon because of this.
Nords are a race that were led to Skyrim by Ysgramor. They are tall, fair-haired and pale-skinned humans from Atmora who are known for their incredible resistance to cold and even magical frost. They are enthusiastic warriors and act as soldiers, mercenaries, merchants and blacksmiths all over Tamriel.
Orsimer are sophisticated, beastlike people of the Wrothgarian Mountains, Dragontail Mountains, Valenwood, and Orsinium. With elven blood coursing through their veins, they are noted for their unshakable courage in war and their unflinching endurance. Typically feared and hated by the other races of Tamriel, the Orsimer have slowly won acceptance in the Empire, and are considered the finest front-line troops in the Emperor’s Legions.
Redguards are the most naturally talented warriors in Tamriel. The dark-skinned, wiry-haired people of Hammerfell seem born to battle, though their pride and fierce independence of spirit makes them more suitable as scouts or skirmishers, or as free-ranging heroes and adventurers, than as rank-and-file soldiers. In addition to their cultural affinities for many armor styles and weapons (particularly swords), Redguards are also physically blessed with hardy constitutions, resistance to poison, and quickness of foot. Redguards do not share the same blood as the other human races, and they have no known connection with the ancestral Nordic homeland of Atmora.