An async function is a programming construct that allows for asynchronous execution of code. In simpler terms, it enables functions to operate without blocking the execution of other code. This is especially useful when dealing with tasks that may take time, such as fetching data from a blockchain or interacting with smart contracts.When an async function is called, it returns a promise. This promise represents a value that will be available in the future, allowing the program to continue running while waiting for the async task to complete. Developers often use the ‘await’ keyword within async functions to pause execution until the promise is fulfilled, making the code easier to read and maintain.In the context of applications that handle transactions or data retrieval, async functions enhance the user experience by keeping the interface responsive. For example, a wallet application might use async functions to check transaction statuses without freezing the user interface during the loading process. This leads to smoother and more efficient applications that can effectively interact with decentralized networks.