What is the name of Barcelona fan base?

Could you elaborate on the fan base of Barcelona Football Club? I'm particularly interested in the moniker or collective name that represents their passionate supporters. I've heard there's a unique term that encapsulates the spirit and devotion of these fans, but I'm not entirely sure what it is. Would you be able to provide that term, and perhaps give a brief description of the culture and tradition behind it? Understanding the identity of these supporters is crucial in grasping the depth of their dedication to the club.