An iPad can be used as an extra screen for a Mac or Windows PC, giving users more space to work on tasks like editing documents or managing multiple apps. Although iPads are not built specifically for this purpose, they can be set up to act as a secondary monitor, which can be especially helpful for people who want to expand their workspace without buying an additional display. For Mac users, Apple provides a built-in feature called Sidecar that lets the iPad function as an external screen. To use this, both the Mac and iPad must be signed in to the same iCloud account. Users can access Sidecar through the Control Center on their Mac by selecting "Screen Mirroring" and then choosing their iPad. This setup allows the iPad to display content at full resolution and can be positioned anywhere for convenience. Another feature called Universal Control, available on compatible Mac and iPad models, allows users to move their mouse or trackpad between devices and even drag and drop files or text between them, creating a more unified computing experience. For Windows users, there are third-party apps that offer similar functionality. Two popular options are Duet Display and Luna Display. Duet Display offers features comparable to Apple’s Sidecar but requires a paid license and must be installed on both the Windows PC and the iPad. Luna Display works a bit differently, as it uses a small device called a dongle that connects to the computer to enable wireless screen transmission. Luna Display is priced at $79 as a one-time purchase and includes a "headless mode" that allows the iPad to be used as a secondary screen even without a separate monitor. Both Duet Display and Luna Display let users control the computer using the iPad’s touchscreen, and they support the Apple Pencil for drawing or navigating more precisely. These tools can be very useful for creative professionals or anyone looking to maximize their workspace. While these solutions are generally easy to use and offer a smooth experience, some users may encounter occasional technical issues such as lag or display problems. To improve performance, using a wired connection or investing in compatible accessories can make a noticeable difference. Additionally, both Mac and Windows users should ensure their devices are running the latest software updates to maintain compatibility and avoid potential issues. Overall, turning an iPad into a secondary monitor can be a practical and cost-effective way to enhance productivity, especially for those who need extra screen space but may not want to invest in a traditional monitor.