Hard rock is a genre of music characterized by its strong beats, loud guitars, and powerful vocals. It emerged in the late 1960s and early 1970s, drawing influences from blues, psychedelic rock, and garage rock. Bands like Led Zeppelin and AC/DC are often credited with popularizing this style, which features heavy use of electric guitars and a focus on rhythm. The lyrics in hard rock songs often explore themes of rebellion, love, and personal struggles. This genre has evolved over the years, giving rise to subgenres such as heavy metal and punk rock. Today, hard rock continues to influence many artists and remains a staple in the music industry.