What is IBM Secret server?

Could you please elaborate on what IBM Secret Server is? I'm curious to know if it's a specialized tool or service offered by IBM that focuses on secure data management and storage. Specifically, how does it differ from other similar solutions in the market? Additionally, what kind of industries or use cases does IBM Secret Server cater to? I'm interested in understanding its key features and benefits, as well as any potential limitations or challenges associated with using it.