Battle Rap ! G-Unit's in the house...

Freestyle rap is an improvisational form of rapping, performed with few or no previously composed lyrics, which is said to reflect a direct mapping of the mental state and performing situation of the artist. It is non-scripted, non-rehearsed, uncut, and the rawest form of hip-hop. Artists will often refer to places and objects in their immediate setting. Freestyle rapping forces an individual to think on the spot, describe their surroundings, and, to a certain degree, rap uncensored from what is inside. It is similar in this sense to improvisational music or acting and draws comparisons to improvisational Jazz in particular. it comes from the mind.

Freestyles are performed a cappella, over beatboxing and over instrumental versions of recorded hip hop songs. Impromptu, non-narrative raps in this style are often called freestyles even if entirely pre-written and memorized. Note that a degree of improvisation will commonly remain in the latter two cases, since the performer usually must match the syncopation of his or her rhymes to the rhythm provided in real time.

Battle rapping, which can be freestyled, is the competition between two or more rappers in front of an audience. The tradition of insulting one's friends or acquaintances in rhyme goes back to the dozens, and was portrayed famously by Muhammad Ali in his boxing matches. The winner of a battle is decided by the crowd and/or preselected judges. According to Kool Moe Dee, a successful battle rap focuses on an opponent's weaknesses, rather than one's own strengths. Television shows such as BET's 106 and Park and MTV's DFX host weekly freestyle battles live on the air. Battle rapping gained widespread public recognition outside of the African-American community with rapper Eminem's movie, 8 Mile.

The strongest battle rappers will generally perform their rap fully freestyled. This is the most effective form in a battle as the rapper can comment on the other person, whether it be what they look like, or how they talk, or what they wear. It also allows the rapper to reverse a line used to "diss" him or her if they are the second rapper to battle.