That's the situation where the phone battery, with no different use by the owner, suddenly drains for no apparent reason. It turns out this is often caused by Google, and there's a simple way to halt the drain.
(April 2014) (Learn how and when to remove this template message) A network host is a computer or other device connected to a computer network. A network host may offer information resources, services, and applications to users or other nodes on the network.
A parasite is an organism that lives on or in a host and gets its food from or at the expense of its host. Parasites can cause disease in humans.