Which execution model allows tasks to run without waiting for previous tasks to finish?

The asynchronous execution model is characterized by the ability for tasks to initiate and run independently of the completion of other tasks. This means that when a task is called, the system does not halt and wait for that task to finish before moving on to initiate the next one. Instead, it can allow multiple tasks to be in progress simultaneously, enabling more efficient use of resources and reducing idle time.

In scenarios where tasks may involve waiting for an external resource or a time-consuming operation (like network requests, database queries, or complex calculations), asynchronous execution enables the system to handle other operations during that waiting period. This ultimately results in smoother and more responsive applications, especially in environments like web servers or user interfaces where responsiveness is crucial.

Other execution models, such as synchronous, sequential, and parallel, do not share this characteristic to the same extent. Synchronous execution requires each task to complete before the next one starts, while sequential execution strictly follows an ordered process. Parallel execution allows tasks to run simultaneously, but it still depends on the task management structure and can often require more complex coordination compared to the straightforward independence of asynchronous tasks.