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- Tightwire is the art of maintaining balance while walking along a tensioned wire between two points. It can be done either using a balancing tool (umbrella, fan, balance pole, etc.) or "freehand", using only one's body to maintain balance. Typically, tightwire performances will fall into one of two distinct types of acts: dance/movement or object manipulation. It is common for tightwire artists to include a variety of props in their acts, such as clubs or rings, hats or canes in order to help them maintain their balance. Other artists will take props onto the wire in order to enhance the entertainment value. These often include juggling clubs, spinning plates, wheelbarrows with passengers, ladders, pets and children.
- Highwire is the same as tight wire but at much greater height. Although there is no official height when tight wire becomes high wire, generally a wire over twenty feet high will be regarded as a high wire act. Traditionally, the difference is in style of performance.
- Slackwire is when the tension on the wire is mainly provided by the load, i.e. the performer and props. The difference is that to balance on a tight wire the performer must keep his centre of mass above his feet, while on a slack wire he moves the wire with his balance to under his centre of mass. Without the wire under your centre it wobbles.[clarification needed]
- Skywalk is a form somewhat akin to highwire, but generally defined by its length and height, often taking place outdoors at great heights, often between skyscrapers, gorges, mountains or other natural and man-made landscapes.
- Slacklining is a balance sport which utilizes nylon webbing stretched tight between two anchor points. Slacklining is distinct from tightrope walking in that the line is not held rigidly taut; it is instead dynamic, stretching and bouncing like a long and narrow trampoline.
- Freestyle slacklining (a.k.a. “rodeo slacklining") is the art and practice of cultivating balance on a piece of rope or webbing draped slack between two anchor points, typically about 15 to 30 feet (9.1 m) long and a couple feet off the ground in the centre. This type of slackline provides a wide array of opportunities for both swinging and static maneuvers. A freestyle slackline has little tension in it (relative to the weight of the performer,) while both traditional slacklines and tightropes are tensioned. The slackness in the rope or webbing allows it to swing at large amplitudes and adds a different dynamic to the art.
- Funambule (French)
- Jultagi (Korean)
Acrobats maintain their balance by positioning their centre of mass directly over their base of support, i.e. shifting most of their weight over their legs, arms or whatever part of their body they are using to hold them up. When they are on the ground with their feet side by side, the base of support is wide in the lateral direction but narrow in the sagittal (back-to-front) direction. In the case of highwire-walkers, their feet are parallel with each other, one foot positioned in front of the other while on the wire. Therefore, a tightwire walker's sway is side to side, their lateral support having been drastically reduced. In both cases, whether side by side or parallel, the ankle is the pivot point.
A wire-walker may use a pole for balance or may stretch out his arms perpendicular to his trunk in the manner of a pole. This technique provides several advantages. It distributes mass away from the pivot point, thereby increasing the moment of inertia. This reduces angular acceleration because a greater force is required to rotate the performer over the wire. The result is less tipping. In addition the performer can also correct sway by rotating the pole. This will create an equal and opposite torque on the body.
Tightwire-walkers typically perform in very thin and flexible, leather-soled slippers with a full length suede or leather sole to protect the feet from abrasions and bruises while still allowing the foot to curve around the wire. Though very infrequent in performance, amateur, hobbyist, or inexperienced funambulists will often walk barefoot so that the wire can be grasped between the big and second toe. This is more often done when using a rope, as the softer and silkier fibres are less taxing on the bare foot than the harder and more abrasive braided wire.
Famous tightrope artists
- Charles Blondin, a.k.a. Jean-François Gravelet, crossed the Niagara Falls many times
- Robert Cadman, early 18th-century British highwire walker and ropeslider
- Con Colleano, Australian, "the Wizard of the Wire"
- David Dimitri, Swiss highwire walker
- Pablo Fanque, 19th-century British tightrope walker and "rope dancer", among other talents, although best known as the first black circus owner in Britain, and for his mention in the Beatles song, Being for the Benefit of Mr. Kite!
- The Great Farini, a.k.a. Willie Hunt, crossed the Niagara Falls many times
- Farrell Hettig, American highwire walker, started as a Wallenda team member, once held record for steepest incline for a wire walk he completed in 1981
- Adil Hoshur (Ahdili Wuxiuer), Chinese (Uyghur), from Xinjiang, performer of the Uyghur tradition of highwire-walking called dawaz; record-holder for highest wire-walk, in 2010 he set a Guinness Book world record by living on wire for 60 days, at Beijing's Bird Nest Stadium 
- Jade Kindar-Martin and Didier Pasquette, an American-French highwire duo, most notable for their world-record setting skywalk over the River Thames in London
- Henri L'Estrange, 19th century Australian; first person to tightrope walk across Sydney harbour and early balloonist
- Elvira Madigan, Danish 19th-century tightwire walker
- Bird Millman, American star of Ringling Brothers & Barnum and Bailey Circus
- Rudy Omankowski, Jr., French-Czech highwire walker, holds record for skywalk distance
- Stephen Peer, after several previous successful crossings, fell to his death at the Niagara Falls in 1887
- Philippe Petit French highwire-walker, famous for his walk between the towers of the World Trade Center in New York City in 1974
- Eskil Rønningsbakken, Norwegian balancing artist whose feats include tightrope walking between hot air balloons in flight
- Maria Spelterini, Italian highwire walker, first woman to cross the Niagara Falls
- Falko Traber, German tightwire walker, walked to the Sugarloaf Mountain in Rio de Janeiro
- The Flying Wallendas, famous for their seven- and eight-person pyramid wire-walks
- Karl Wallenda, founder of the Flying Wallendas, died after falling from a wire on March 22, 1978 at age 73 while attempting to cross between the two towers of the Condado Plaza Hotel in San Juan, Puerto Rico
- Nik Wallenda, great-grandson of Karl, second person to walk from the USA to Canada over the Horseshoe Falls at the Niagara Falls on June 15, 2012; with his mother Delilah (Karl's granddaughter), completed his great-grandfather's final attempt between the two towers of the Condado Plaza Hotel on June 4, 2011. On June 23rd, 2013 he successfully walked over a gorge in the area of the Grand Canyon.
- Rick Wallenda, American highwire walker, performed a record-breaking skywalk of 2,000 feet (610 m) at Kings Island on July 4, 2008, breaking Karl Wallenda's record walk
The word funambulism or the phrase "walking a tightrope" is also used in a metaphorical setting not referring to any actual acrobatic acts. For instance, politicians are said to "walk a tightrope" when trying to balance two opposing views with little room for compromise. The term can also be used in satirical or acidic contexts. Nicholas Taleb uses the phrase in his book Black Swan. "You get respect for doing funambulism or spectator sports". Taleb is criticising scientists who prefer popularism to vigorous research and those who walk a fixed and narrow path rather than explore a large field of empirical study. 
- Mark Zaloudek (August 27, 2006). "Farrell Hettig found success on high wire and in business". Sarasota Herald-Tribune. Retrieved June 16, 2012.
- Tightrope Walking, A Uyghur Tradition Radio Free Asia, retrieved December 13th, 2010.
- "Wallenda Enterprises Inc. - Exceeding The Limits of Tradition". Retrieved 2008-07-30.
- Rossiter, Marie. "Tight-rope walker breaks record at Kings Island". Dayton Daily News. Retrieved 2008-07-04.
- Taleb, Nicholas. Black Swan. 2010 UK. p.368
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