What is South Korea's main export?

Could you please clarify for me what the primary export of South Korea is? I'm interested in understanding the country's economic strengths and how it contributes to global trade. Could you possibly elaborate on the types of products or services that are most commonly exported, and maybe even mention the significance of these exports to South Korea's economy? Additionally, are there any particular industries or sectors that stand out as the leading contributors to the country's export revenue? I'm keen to gain a deeper understanding of this aspect of South Korea's economy.