Use an iPad as a Second Monitor for PC or Mac
Do you happen to have an extra iPad laying around the house that you no longer use?
Luckily, with some ingenious software, you can use your older iPads (2nd, 3rd, or 4th generation), iPad Airs (1 & 2), or iPad Pros as a second screen or second monitor to your Mac or Windows PC. This involves installing an app on your iPad and on your computer and then connecting the two directly using either a lightning cable or 30-pin cable (dock connector).
We recommend is Duet Display. There are other options like Air Display and iDisplay, but both cost about the same and don’t work nearly as well. The direct connection between the computer and iPad make the experience virtually lag-free, which is very important when using a second screen. Trying to do this over WiFi (i.e. Air Display) is slower and not a good implementation.