Signal, a secure end-to-end encrypted messaging app, is expanding its features to appeal to a broader audience, with the goal of becoming a mainstream communications platform. The app has added support for iPad, ephemeral images and video, and customizable stickers, among other features. Signal's user base has grown significantly, with over 10 million downloads on Android alone, and the app is now used by a wide range of people, including politicians, activists, and ordinary users. The app's development is supported by the Signal Foundation, a nonprofit organization founded by Moxie Marlinspike and Brian Acton, a co-founder of WhatsApp.