This is a collaboration between French DJ and producer David Guetta and Australian singer-songwriter Sia. The song is an upbeat dance-pop track with an infectious beat and catchy chorus. Lyrically, the song is about a passionate and intense love that is burning like a flame.
From Wikipedia
"Flames" is a song by French DJ and record producer David Guetta and Australian singer-songwriter Sia. The song was released on 22 March 2018 by What a Music, as the third single from Guetta's seventh studio album, 7 (2018). The duo's seventh collaboration, it was written by Sia, Guetta, Christopher Braide, Giorgio Tuinfort and Marcus van Wattum, with production handled by the latter three.