just like the name states, it's a ad service Samsung uses for certain apps that contain ads that will use "their" ad's, not Googles... Way to make money on free stuff basically.. Anytime you go into, or download something, from the Samsung Apps Store, it is auto installed...
Strange - whenever I start the Samsung App Store, it does prompt me to install Adservice, but I just select Cancel and it merrily continues on to the App Store.
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