What is justin biebers best selling song?

Justin Bieber's best-selling song is "Sorry", released in 2015 from the album Purpose. It achieved massive commercial success, shattering multiple sales and streaming records. "Sorry" topped charts worldwide, including the Billboard Hot 100, and achieved diamond certification in the United States, indicating sales and streaming equivalent to 10 million units. It was also recognized as one of the best-selling songs of all time by various publications and music industry organizations. The song's success was driven by its catchy melody, infectious beat, and Bieber's emotional and heartfelt performance.