Poi is a performing art and also the name of the equipment used for its performance. As a skill toy, poi is an object or theatrical prop used for dexterity play or an object manipulation. As a performance art, poi involves swinging tethered weights through a variety of rhythmical and geometric patterns. Poi artists may also sing or dance while swinging their poi. Poi can be made from various materials with different handles, weights, and effects (such as fire).

Poi originated with the Māori people of New Zealand, where it is still practised today. Poi has also gained a following in other countries. The expansion of poi culture has led to a significant evolution of the styles practised, the tools used, and the definition of the word "poi".

In the Māori language, poi can mean the physical objects used by the dancers, the choreography itself, or the accompanying music. In Māori culture, poi performance is usually practised by women. Some legends indicate that it was first used by men to develop wrist flexibility for the use of hand weapons such as the club-like patu, mere, and kotiate, but recent academic study has found no evidence to confirm this story.

Māori poi come in two forms: short, with strings equal to the length of the fingertips to the wrist; and long, with strings equal to the distance from fingertips to shoulder. A performance includes storytelling and singing in conjunction with choreographed poi routines and is often presented alongside other disciplines, such as waiata a ringa, haka and tītī tōrea (included in kapa haka performances). Poi feature in the 1980s hit song "Poi E".

Originally, poi were most commonly made from harakeke (New Zealand flax, Phormium tenax) and raupō (Typha orientalis). Makers stripped and scraped flax to provide the muka (inner flax fibre), which was twisted into two strands to make the taura (cord) as well as the aho (ties). A large knot was tied at one end of the cord, around which the core was formed from the pithy middle of the raupō stem. Dampened strips of raupō stems were then wrapped around the ball and tied off around the cord, forming the covering . The other end of the cord was often decorated with a mukamuka, a tassel made from muka formed around a smaller knot. Occasionally, smaller tassels called poi piu were affixed to the base of the poi ball. Construction and design varied widely depending on regional, tribal, and personal preferences.

Another variety of poi is poi tāniko. In this construction, the outer shell was made of finely woven muka using a pattern based on a fishing net; these poi sometimes included strands that were dyed yellow to form a diamond pattern known as Te Karu ō te Atua (the Eye of God).

In the late 19th century and the first half of the 20th century, a cottage industry developed from the manufacture of raupō poi for sale to tourists, especially in the Rotorua area. Tourist-friendly variations included miniature poi that could be worn in buttonholes and as earrings.

Today, most performance poi are made from durable and readily available modern materials. Cores are often made of foam or crumpled paper, while skins consist of plastic or loomed fabrics, such as tulle. Tassels are usually made of wool.^{[citation needed]}