Can you explain the differences between concurrency, asynchrony, and parallelism in programming?

Concurrency, asynchrony, and parallelism are different but related concepts in programming:

• Concurrency is the ability of a system to manage multiple tasks that can be executed simultaneously or alternately, switching between them. It is about organizing work so that tasks do not block each other.

• Asynchrony is a method of executing operations where a task is started and does not block the main thread, allowing work to continue. The result of the operation is processed later, when it completes.

• Parallelism is the simultaneous execution of multiple tasks on different processors or cores.

Example on Android:

• Concurrency — multiple threads in an application that can switch and perform different tasks.
• Asynchrony — using AsyncTask or Coroutine to perform network requests without blocking the UI.
• Parallelism — if the device has multiple cores, multiple threads can actually run simultaneously.

Thus, asynchrony and parallelism are ways to implement concurrency.