What is the function of the Astar?

Could you please elaborate on the function of the Astar in the context of cryptocurrency and finance? I'm particularly interested in understanding how it differs from other platforms or protocols in this space. Is it primarily focused on smart contract capabilities, decentralized finance applications, or perhaps a combination of both? How does it enable users to interact with blockchain networks in unique ways? Additionally, what are some of the key benefits or advantages that Astar offers to its users and the broader crypto ecosystem?