How is the execution of tasks implemented in parallel in programming?

In C#, parallel execution of tasks is implemented using several approaches:

• Threads — creating and managing threads manually through the Thread class.
• ThreadPool — using a pool of threads for reuse without the overhead of creating new threads.
• Tasks — a higher-level abstract mechanism from the System.Threading.Tasks namespace that allows running asynchronous operations.
• Async/Await — simplifies writing asynchronous code, enabling tasks to run in parallel without blocking the main thread.

Example of parallel execution using Task:

using System;
using System.Threading.Tasks;

class Program
{
    static async Task Main()
    {
        Task task1 = Task.Run(() => {
            // Some parallel work
            Console.WriteLine("Task 1 is running");
        });

        Task task2 = Task.Run(() => {
            Console.WriteLine("Task 2 is running");
        });

        await Task.WhenAll(task1, task2);
        Console.WriteLine("All tasks are completed");
    }
}

Thus, parallelism is achieved by running multiple tasks that can execute simultaneously on different threads.