A dual monitor setup helps with overall work organization and efficiency, which is why many people spend a lot of money on a second monitor for their PC. That extra space can be used for making video calls, browsing the web, sending emails, or even drawing with the stylus. But if, for example, you have a Mac and an iPad, you may not have to spend anything to set up both devices.
As long as you have a compatible Mac and iPad, you can quickly and easily connect the two Apple devices and use iPad as an additional display for your laptop. Using Sidecar, which comes built into compatible devices, you can extend your macOS desktop or mirror it to iPad, as it's equipped with touchscreen controls to seamlessly use the two devices together.