Siri isn't just a pretty voice with the answers. It's also been recording and keeping all the questions users ask.
Exactly what the voice assistant does with the data isn't clear, but Apple confirmed that it keeps users' questions for up to two years. Siri, which needs to be connected to the Internet to function, sends all of its users' queries to Apple.
Apple revealed the information after Wired posted an article this week raising the question and highlighting the fact that the privacy statement for Siri wasn't very clear about how long that information is kept or what would be done with it.
Technically Apple keeps Siri user data for six months, associating that data with the user. After that time, the company will disassociate users from the data, meaning it will remove any identifiers for who input that particular query into Siri. But for the next 18 months, Apple said, it keeps the disassociated data for the sake of product testing and improvement purposes.