Nickelback is a Canadian rock band that has been active since 1995. They have been described as various genres, including post-grunge, hard rock, and pop rock. While they have achieved significant commercial success and are considered to be at the top level in the music industry, they have also received a lot of criticism and are often labeled as one of the most hated bands on the planet. Despite this, they have continued to release music and tour for over 25 years. Therefore, Nickelback is primarily considered a rock band.