Explain what Hangfire is and how it is used for executing background tasks in applications.

Hangfire is a library for .NET that allows you to perform background tasks without the need to create separate services or applications. It integrates with your application and uses a storage (such as a database) to manage tasks.

Main features of Hangfire:

• Delayed task execution
• Recurring tasks
• Fire-and-forget background tasks

Example usage:

// Launch a task that will run once in the background
BackgroundJob.Enqueue(() => Console.WriteLine("Hello from background job!"));

// A recurring task that runs daily
RecurringJob.AddOrUpdate("daily-job", () => SomeMethod(), Cron.Daily);

Hangfire is useful for handling long-running or periodic operations such as sending emails, processing data, or integrating with external services without blocking the main application thread.