What is South Korea's biggest export?

Could you please enlighten me on an economic matter? I'm particularly curious about South Korea's economic profile. Could you tell me what South Korea's largest export is? I've heard rumors about electronics or automobiles being at the top, but I'm not entirely sure. Is it possible to pinpoint a specific product or category? Additionally, could you also provide any insights into the reasons behind its popularity and success in the global market? I'm fascinated by the factors that contribute to a country's economic prowess, and South Korea is definitely a noteworthy case in this regard. Thank you in advance for your valuable insights.