[android-developers] services x threads

Hi,

I'm trying to understand the idea behind the Services.

If it runs in the program's thread, why not create just a separate
thread (or AsyncTask) to do the job?

Can a service keep running in the background? For example, i want to
create a task that will continuously be polling data from a server,
even if the main application is not running. Can this be achieved with
a Service?

thanks

guich

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