What problem does Cardano solve?

Could you elaborate on the challenges that Cardano addresses? I'm particularly interested in understanding the specific problems it solves in the realm of cryptocurrency and finance. Is it scalability issues? Privacy concerns? Or perhaps, the integration of blockchain technology into existing financial systems? Could you also discuss how Cardano's unique features and innovations contribute to solving these problems? I'm keen to learn more about its approach and how it differs from other cryptocurrencies.