A tankini is a type of two-piece swimwear that consists of a tank top and a bottom. The tank top is similar to a camisole and covers the torso, while the bottom is similar to traditional swimwear bottoms. The tank top can be either straight or fitted and may have adjustable straps or be strapless. Tankinis are popular among women who prefer more coverage than a bikini but still want to show some skin. They are also a good choice for women who want to conceal their midriff but still want to wear a two-piece swimsuit. The bottoms of a tankini can vary in style and cut, including briefs, skirts, shorts, or swim skirts.

The tankini, first debuted in the late 1990s, is a bathing suit that combines a tank top, typically made of spandex and cotton or Lycra and nylon, and a bikini bottom. Some people believe that this style of swimwear offers modesty that is closer to a one-piece suit with the ease of a two-piece suit because the entire suit does not need to be taken off to use the restroom. Tankinis come in many different designs, hues, and shapes; some even have features like built-in push-up bras. It is especially well-liked as beachwear for kids and as an activewear option suitable for triathlons. This amphibious sportswear for sand or sea, according to Katherine Betts, director of fashion news for Vogue, allows users to go rafting, play volleyball, and swim without worrying about losing their top.

A tank top consists of a sleeveless shirt with a low neck and adjustable shoulder straps that vary in width and style. It is named after tank suits, one-piece bathing costumes of the 1920s worn in tanks or swimming pools. The upper garment is worn either by men or women, having a greater variety of models available for women. In men, it is usually used as underwear.