This afternoon Google introduced Android Instant Apps, a system with which Android apps will be able to open as quick as a web link. With this system, developers will be able to present just tiny pieces of the apps they've already made. Users will be able to see just one part of an app without having to download the whole thing. Easy and smooth - and backwards compatible. This system will be released into the wild as soon as Google's done working on it - which doesn't appear to be all that long from now.