The iPad was first introduced in January 2010 and made its debut in April 2010. Since the original announcement, there have been 5 additional iPad generations, a new "Mini" series of 7.9-inch iPad tablets, and most recently, a 12.9-inch iPad "Pro" and its smaller 9.7-inch counterpart

iPad 2
iPad 3
iPad 4
iPad 5

iPad Mini
iPad Mini 2
iPad Mini 3
iPad Mini 4

iPad Air
iPad Air 2
iPad Pro 9.7-inch
iPad Pro 12.9-inch