“When we use data to create better experiences for you, we work hard to do it in a way that doesn’t compromise your privacy. One example is our pioneering use of Differential Privacy, where we scramble your data and combine it with the data of millions of others. So we see general patterns, rather than specifics that could be traced back to you. These patterns help us identify things like the most popular emoji, the best QuickType suggestions, and energy consumption rates in Safari.”

Source : Privacy – Apple