Portable and arranger keyboards integrate auto-accompaniment features and lightweight designs for on-the-go musicians. Developed in the late 20th century, these keyboards revolutionized live performance and composition. Leading brands include Yamaha (PSR Series), Korg (Pa Series), Casio (CT-X Series), and Roland (E-X Series). With built-in rhythms, chord recognition, and soundbanks, these keyboards are perfect for solo performers, educators, and beginners. Arranger models enable full-band backing, making them ideal for one-person gigs, songwriting, and home practice, while entry-level variants serve as affordable learning tools.