What is cartesi ctsi?

Excuse me, could you please explain what Cartesi CTSI is? I've heard about it in the context of cryptocurrency and blockchain technology, but I'm not entirely clear on its purpose or how it works. Is it a new type of cryptocurrency? Or is it a platform or tool for developers to build on? Could you provide a brief overview of its key features and benefits? I'm particularly interested in understanding how it aims to solve any existing problems or inefficiencies in the industry. Thank you.