Instagram is beta testing a very useful feature right now, the ability to swap between multiple accounts on the fly.
This test is currently only on Android and users can opt in by joining the companys beta programme and downloading the latest version of the software. From there, it should be simple to add multiple accounts and swap between them at the touch of a button at the top right of the screen.
This should be useful for those who operate a personal and business account and want to be able to keep up to date without having to log out and back in multiple times. The beta rollout is available to a large number of people so its reasonable to assume that it will be offered to all users with the next major update to the app.