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Services are inherently structured in a way that it runs in the background, without draining resources. A well designed service should only issue a resource to an activity or application and then shut off once the activity/application has satisfied its requirements from the service.

A *nix daemon/Windows service, are completely different in that, they poll and use up a lot of CPU time, which is prohibitly expensive on a Android handset.

An example of such a service, is, GTalk to check if there's any new emails via GMail application (which communicates via that service) and consumes as little power and resource as possible, within a reasonable time limit.

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