One would say it is just movements of body parts and/or body itself, but is it really? Dance is a physical & visual art form of story telling & expressing/communicating emotions. Sure, it is fun, but it also requires a lot of attention, discipline, commitment & flexibility.
Although there is no definate knowlege of origin of dance, it is believed that the earliast traces were found in India in forms of paintings & sculptures. Also Bharata Muni's Natyashastra (literally "the art of dance") is one of the earlier texts on dancing.
India offers a number of classical Indian dance forms, each of which can be traced to different parts of the country. Each form represents the culture and ethos of a particular region or a group of people. The seven main styles are still practised in India are:
Bharatnatyam - Tamil Nadu
Kathak - Uttar Pradesh
Kathakali - Kerala
Kuchipudi- Andhra Pradesh
Manipuri - Manipur
Mohiniattam - Kerala
Odissi - Orissa
Also there are Folk Dances in India which are specialised dances for occasions like marriage, seasons, rites, celebrations, etc. Folk dances vary geographically, some of them are the Chauu dance of Bihar, Garba of Gujarat, Bhangra of Punjab and Banjara of Andhra Pradesh.
Folk Dances Of Central India
Folk Dances Of Eastern India
Folk Dances Of Northern India
Folk Dances Of North Eastern India
Folk Dances Of North West India
Folk Dances Of South India
Folk Dances Of South West India
Besides these, there are popular Modern/ Bollywood style dances. The dancing in Bollywood films, especially older ones, was based on classical dance styles, dances of historic northern Indian courtesans (tawaif), or folk dances. In modern films, Indian dance elements often blend with Western dance styles (as seen on MTV or in Broadway musicals), though it is not unusual to see Western pop and pure classical dance numbers side by side in the same film. Bollywood films have always used what are now called "item numbers". A physically attractive female/male character performs a catchy song and dance number in the film.
All around the world, there are countless forms of dances, but to mention few are: Jig, Waltz, Tango, Disco, Salsa, Electronica, Hip-Hop, Ballet , Classical ballet, Tap dance, Jazz dance, Swing dance, breakdance, and rock and roll dance.