"Bella Ciao" is an Italian folk song that originated in the late 19th century. It was initially sung by rice workers in the Po Valley, expressing their struggles against harsh working conditions. Over time, the song became associated with the Italian resistance movement during World War II, symbolizing the fight against fascism and oppression. The song's catchy melody and poignant lyrics have led to its popularity worldwide. It has been featured in various films and television shows, notably in the Spanish series La Casa de Papel (Money Heist), where it represents rebellion and solidarity among the characters.