What is KCS in customer support?

Could you please explain to me what KCS stands for in the context of customer support? I've heard it mentioned a few times but I'm not entirely sure what it means or how it's applied in this field. Could you elaborate on its definition, its origins, and perhaps give an example or two of how it might be used in a customer support scenario? I'm particularly interested in understanding its benefits and how it might improve the overall customer experience. Thank you for your assistance in clarifying this topic for me.