What is KCS in banking?

Could you please clarify for me what exactly KCS stands for in the context of banking? I've heard this term mentioned a few times, but I'm not quite sure of its definition or its significance within the financial industry. Could you possibly provide a brief overview of what KCS represents, how it's used, and perhaps some examples of its application in banking? It would be greatly appreciated if you could explain this concept in a way that's easy to understand for someone who's not a finance expert. Thank you in advance for your assistance!