Snap as a dance move

Dance move

Dance moves or dance steps are the building blocks of many dances.More complex dance moves are called dance patterns, dance figures or dance variations....

 is a brisk, abrupt body/head/arm/hand action varying in style in different dances. It may involve body ripple (body wave), abrupt turn of the head, hip motion, etc. Not to be confused with the Hip hop

Hip hop

Hip hop is a form of musical expression and artistic culture that originated in African-American and Latino communities during the 1970s in New York City, specifically the Bronx. DJ Afrika Bambaataa outlined the four pillars of hip hop culture: MCing, DJing, breaking and graffiti writing...

 style of Snap dance, which is based on finger snapping.

Snap is mostly seen as a stylistic embellishment of the dance and often used at the moments of changing of the direction of movement/rotation.

• In Salsa
  Salsa (dance)
  Salsa is a syncretic dance form with origins in Cuba as the meeting point of Spanish and African cultures.Salsa is normally a partner dance, although there are recognized solo forms such as solo dancing "suelta" and "Rueda de Casino" where multiple couples exchange partners in a circle...
  
  , head snaps are a notable part of lady's styling.
• In Electric Slide
  Electric Slide
  The Electric aka The Electric Slide is a four wall line dance set to the Marcia Griffiths' song Electric Boogie. Choreographer Ric Silver created the dance in 1976.- Controversy :...
  
  , "snap" is an action on a specified beat in a variant of step pattern description.
• Breakdancing

Head snaps in Tango

In ballroom Tango

Tango (dance)

Tango dance originated in the area of the Rio de la Plata , and spread to the rest of the world soon after....

, International Style, head snaps or head flicks are a characteristic element of its staccato

Staccato

Staccato is a form of musical articulation. In modern notation it signifies a note of shortened duration and separated from the note that may follow by silence...

 style, as distinguished from, e.g., Argentine tango

Argentine tango

Argentine tango is a musical genre of simple quadruple metre and binary musical form, and the social dance that accompanies it. Its lyrics and music are marked by nostalgia, expressed through melodic instruments including the bandoneon. Originated at the ending of the 19th century in the suburbs of...

. For example, a sharp head snap is an advanced action in the Promenade Link figure (the basic description says: "lady turns her head to the right").