The Hercules Fitness Center has a website named, HercFit.com. Last year, they released a mobile app available on both Android and iOS. They encourage users to use the app instead of the website because of its advanced capabilities. Currently, they advertise on YouTube and several other sites. When customers click on an ad, it takes them to HercFit.com instead of the app. What web technology can open the mobile app from a click on a web ad?