Boardshorts (occasionally in British English, swim shorts) are a practical style of men's and, recently, women's swimwear. They were originally developed for aquatic sports, specifically for surfing, but in more recent years they have grown in popularity outside of these sports, and have become a popular form of general beach and swimwear.
The name of "boardshorts" originates from their affiliation with aquatic sports that use a board, such as surfing. They are sometimes called "boardies" in slang, especially in Australia, and "baggies" in South Africa.