The full form of DJ is Disc Jockey. A DJ is a person who plays recorded music for an audience, typically at a party, pub, disco, or club. DJs may also create mixes, remixes, and tracks that are recorded for later sale and distribution. The term "DJ" is used as an all-encompassing term to describe someone who mixes recorded music from any source, including vinyl records, cassettes, CDs, or digital audio files stored on USB stick or laptop. DJs may adopt the title "DJ" in front of their real names, adopted pseudonyms, or stage names. There are different types of DJs depending on their workplace, including radio DJs, club DJs, and mobile DJs. Radio DJs introduce and play music that is broadcasted on AM, FM, and Internet radio stations, while club DJs play music, party songs, and remix songs with their own creativity in party halls, pubs, and clubs. Mobile DJs play recorded music at events like weddings and high school or college festivities while traveling with portable sound systems.