What problems does Avalanche solve?

Could you please elaborate on the issues that Avalanche addresses? I'm particularly interested in understanding how it innovates in the realm of cryptocurrency and finance. Does Avalanche offer a unique solution to scalability challenges? How does it ensure transaction speed and efficiency? Moreover, what measures has Avalanche taken to address security concerns within the blockchain ecosystem? I'm also curious to know if Avalanche has any specific advantages when it comes to interoperability and cross-chain functionality. Finally, could you discuss the potential impact of Avalanche on the broader cryptocurrency market and how it fits into the evolving landscape of digital finance?