US tech giant Apple is set to release its new anti-tracking feature in April or May, which aims to crack down on apps that track iPhone users. The feature, called App Tracking Transparency, will come into force in the spring with an upcoming release of iOS 14. App Tracking Transparency will require all apps to get the user's permission before tracking their data across apps or websites owned by other companies. It will let users go to their Settings and see which apps have requested permission to track them, and make any changes as they see fit. The update, which was delayed last year, is a blow to Facebook and other digital services with apps that depend on such data surveillance to help sell ads.