Candela literally means "candle" or "fire". However, in many Latin American contexts, especially in Colombia, it's used as slang to describe something that is intense, exciting, or really good.
In this song, ChocQuibTown uses "candela" repeatedly to emphasize that their music and the vibe they create are incredibly hot, energetic, and exciting. It's a vibrant word that perfectly captures the lively and passionate spirit of the song.
ChocQuibTown built "Sencillo" around one repeated hook: "Sencillo a capela" ["Simple, a cappella"], the group stripping their own sound down to bare voices between full-band hits. Goyo introduces herself as "La reina del combo" ["the queen of the group"], and the trio trade verses about staying grounded instead of chasing status: "Soportamos lluvia, soportamos crisis" ["We put up with rain, we put up with crisis"], and later "No somos rivales, amigo despierta" ["We're not rivals, friend, wake up"] pushes back on the idea that Colombian artists have to compete instead of support each other.
The song doubles as a shoutout to home. "Siempre el pacifico en talla" ["The Pacific always measures up"] ties the hook back to the group's roots on Colombia's Pacific coast, and the constant callback to "candela" ["fire"] treats the whole track as one long ad-lib: not much plot, just a beat built for a room to shout the hook back.