Music

     K-pop is an exceedingly  well commercial industry all throughout Asia. Contemporary k-pop is dominated by dance groups featuring young entertainers with the latest looks and dance skills. (wikipedia) In all of Asia, contemporary korean music and pop stars are very popular; the spread of contemporary and pop culture was reflected in one word: Hallyu. The term Hallyu 한류, is a word used to discuss the influence of the contemporary korean pop culture on the rest of Asia and the world. 

Genres

Trot (teuroteu): The oldest form of k-pop

Rock

Folk (T'onga Guitar): form of Korean folk and folk rock music developed in the early 1960s and '70s

Hip-Hop

Ballads

Hybrid: mixture of ballad, rap, reggae, R&B, and hip hop

Dance

     Dance is essential to k-pop. When bringing together multiple people in a group, the singers often would switch their positions while singing and dancing by making prompt movements in synchrony. Since the debut of Seo Taiji & Boys, multiple singers began to switch their positions while singing and dancing, a strategy called "formation changing" {Korean: 자리 바꿈, Jari ba'ggum} and a turning point for the establishment of K-pop choreography {Korean: 안무, Anmu}. (wikipedia) K-pop choreography also incorporates what is called "point dancing"; meaning a dance is made up of hooking and repetitive movements that is placed within the choreography. Key movements that stand out and can easily be remembered are supposed to fit in and match with the characterisitcs of the lyrics of the song. 

     When creating a choreography the tempo of a song must be taken into consideration as well as the capability of fans to be able to follow along and learn the dance as well. "The Korean people really want their fans to be in the music as well. That's why as choreographers we have to simplify movements," according to Ellen Kim, a Los Angeles dancer and choreographer. (wikipedia)

Fashion

     K-pop has an influence on fashion, prominetly in Asia, where clothes and accessories, hairstyles, and cosmetic brands worn by k-pop stars are often sought after by their young listeners. Even fashion brands themselves release copies of articles of clothing worn by idols. Some k-pop idols including G-Dragon from Big Bang have established themselves as a fashion icon by attracting the attention of Western fashion designers, most notably Jeremy Scott, who expressed his interest in working with singer CL from  2ne1. (wikipedia)