Adele is a British singer-songwriter who released her third studio album, 25, in 2015. The album was a commercial success, becoming the best-selling album of the year and the best-selling album of the decade in the UK. It also became the world's best-selling album of 2015, with over 17 million copies sold worldwide. The lead single from the album, 'HELLO', was a global success, reaching number one in almost every major music market.