Apple A10 is a chip that was made by Apple. It has four cores and runs at between 1.6 and 2.34 GHz. It was first released in 2016. It is used on the iPhone 7, iPhone 7 Plus, iPod Touch 7th Generation, iPad 7th Generation and the iPad 6th Generation.
Timeline of Apple silicon
Sources: Apple press release library, Mactracker Apple Inc. model database