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Collect information about the user's browsing experience in the shop, usually anonymously, although sometimes they also allow the user to be uniquely and unequivocally identified in order to obtain reports on the user's interests in the products or services offered by the shop.
A solution for attenuating, but not completely isolating, unpleasant sounds when travelling by air, rail or car. In aeroplanes, it regulates the annoying pressure in the eardrum during take-off and landing.