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Some free android apps do not have advertisements, while others do. Adware is free software that has advertisements for other products and services displayed within the app that you see while you use the app. They connect to the Internet, using your data, and update the advertisements. The more aggressive ones collect data about you from your device memory and send it back to companies that use that data. Finally, the most aggressive adware actually downloads and installs trial apps onto your device without your permission.Some free android apps do not have advertisements, while others do. Adware is free software that has advertisements for other products and services traditionally (until recently) displayed within the app that you see while you use the app. They connect to the Internet, using your data, and update the advertisements. The more aggressive ones collect data about you from your device memory and send it back to companies that use that data. Finally, the most aggressive adware actually downloads and installs trial apps onto your device without your permission.