What is FMIP?
Find My iPhone (FMiP) Activation Lock is an iOS feature that secures your device against anyone else trying to use or sell your lost or stolen device. When this feature is enabled, the Apple ID and password you use for iCloud is securely stored on Apple’s activation servers and linked to your device. With iOS 8, Activation Lock is turned on by default.
What is iCloud?
iCloud is an Apple email, storage and data synchronization subscription service that provides 5GB of storage for free. It is a service that keeps all your devices in sync. In other words, you can share and update information seamlessly between Apple devices like an iPhone, iPad, iPod touch, and a computer.