How does concurrency work with Node.js Promises?

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Node.js Promises allow for concurrent execution of multiple asynchronous tasks. When a promise is created, it is immediately executed asynchronously in the background. As additional promises are created, they are started independently of each other, allowing multiple tasks to be executed concurrently.

When a promise is resolved, it returns the result of its operation to the code that created it. At this point, the code can choose to continue on to the next promise in the chain, or it can wait for all promises to complete before continuing. This allows for efficient and parallel processing of tasks, which can significantly improve the performance of Node.js applications.

In summary, concurrency with Node.js Promises allows for the parallel execution of multiple asynchronous tasks, which can improve the performance and efficiency of Node.js applications.