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The Selkie is an oceanic fae therianthrope native to the mythology of Scotland and Ireland (one of the few things they do share in common). In a nutshell, selkies are a race of fae who spend most of their existence in the form of seals, wandering the ocean and doing seal things, but every so often, they come onto land and take human form. Their precise relationship with the Finfolk, the oft-malevolent undersea faeries of those islands, varies depending on the legend and which region of the isles you actually visit.
Selkies fit into the "animal lover" archetype of therianthropy, using an enchanted seal pelt to assume their sea-going form and slipping it off like a coat when they want to walk amongst humans. Their most common reason for doing this, as you'd expect, is to find some pleasure with human partners - who often steal the pelt in order to trap the selkie in human form and marry them, something that invariably backfires. Unusually, most selkie stories of this kind revolve around male selkies who come for human loving and often fall afoul of the whiles of love-struck human maidens; the reverse, where a human man tries to wed a female selkie, does happen, but it's far from the universal status of similar critters - rather like the Boto, a shapeshifting male river dolphin from the Amazon River.
Children of humans and selkies are usually described as being both drawn to the sea and very good at swimming, which you'd kind of expect. Webbed fingers are also prominent.
Selkies appeared in the early days of Dungeons & Dragons, first appearing in the Monster Manual II, then reappearing in 2e Advanced Dungeons & Dragons in the Monstrous Compendium Volume One and Monstrous Manual. Their last appearance to date remains the Fiend Folio for 3rd edition, although a 3.5 "Dread Selkie" appeared in the Ravenloft netbook "Quoth The Raven #20", alongside a Half-Selkie racial template. Ordinary selkies are a benevolent-leaning neutral, rather like merfolk, whilst Dread Selkies are a more malevolently self-centered version.
Pathfinder, meanwhile, features Selkies in "Night of Frozen Shadows", the second part of its Jade Regent adventure path. The Golarion selkie is a vicious, mischievous and oft-malicious shapeshifting predator, not that dissimilar in many ways from the D&D Seawolf. It was later reprinted in the Bestiary 4.