Rappers are musicians who specialize in hip-hop music, a genre that originated in the United States in the 1970s. The term 'rapper' is often used to refer to artists who write and perform their own lyrics. Critics are people who review and evaluate art, literature, music, and other forms of media. Critics provide an opinion on the quality of the work and can help shape public opinion. In the context of rap music, critics can provide insight into the lyrical content, production quality, and overall impact of a rapper's work.