To implement background jobs or scheduled tasks in ASP.NET Core, you can use libraries like Hangfire, Quartz.NET, or the built-in hosting capabilities of ASP.NET Core. Hangfire allows you to define and schedule background jobs that run asynchronously. Quartz.NET provides a powerful scheduling framework for executing tasks at specified intervals or on specific dates. Additionally, you can leverage the built-in hosting capabilities of ASP.NET Core by using the IHostedService interface to create background tasks or scheduled jobs that start and stop with the application.