The BBC has its own app so that you can keep up with its programs from wherever you are, whether connected to a WiFi network or using your phone's 3G or 4G Internet access. Apart from watching and listening to the channel's live contents, it allows you to download programs to watch them whenever you want, even without an Internet connection. For such purpose, you can access and watch offline the programs broadcast over the last 30 days.
It also incorporates the option to watch certain broadcasts later on. You can search by programs filtering them by date or time, sorted by categories or you can simply access the most viewed contents by other users. Those are usually the most interesting options.
Keep up with everything that's going on thanks to the BBC.
Is it compatible with my Apple TV?
BBC iPlayer allows you to transmit whatever contents you want via Apple AirPlay, without any problems, so that you can watch everything straight on your TV. If you've got a BBC account, you can sync your programs and history on all your Apple devices. Thus, if you're watching something on your iPad but you have to go out, you can resume the playback on your iPhone just where you left it.
Does it work outside the UK?
If you're not in the United Kingdom you might have problems to watch the contents of this app as it's only supposed to be available on British soil, in other words, where you'd usually be able to view the BBC's programs. However, you can simulate your location and pretend to be in England by using some kind of VPN software and fool the app to make it think you're not abroad.