In one sentence, describe what the following article is about:

You can use any web browser on your Android device. You cannot get the full version of AdGuard from the Google Play Store. It's the green button at the bottom of the page.  This downloads the AdGuard apk file. You may be informed that installing these kinds of files can be harmful to your phone.  Tap Ok. Depending on which web browser you are using, this may be an icon with three dots ("…" or "⋮"), or an icon with three horizontal lines (☰).  It is typically located in the upper-right corner or lower-right corner. It's in your web browsers menu.  This displays a list of downloads you downloaded through your web browser. This installs AdGuard on your Android device If you receive a pop-up that says your phone is not allowed to install files from unknown sources, tap the option in the pop-up that opens your Settings menu.  Then tap the toggle switch next to "Allow unknown sources". This installs the AdGuard app using the APK file. It has a green icon that is shaped like a shield that has a checkmark in the middle.  Tap the icon on your home screen or apps menu to open the app, or tap Open in the lower-left corner after the app is installed. It's the green button at the bottom of the screen.  This starts the quick setup process. It's the green button at the bottom of the page. "Comfortable" is the only option available with the free version of AdGuard.  It blocks all known analytics and lower third-party cookie lifetimes.  "High" and "Ultimate" have more features to block your web browser from tracking you.  These options are only available on the Premium version of the app. It's the green button at the bottom of the app. If you do not wish to sign up for AdGuard Premium, tap the "x" icon in the upper-right corner to close the ad. This enables ad protection. While AdGuard protection is on, your battery usage may not be properly reflected in the Settings menu.

Summary:
Navigate to https://adguard.com using a web browser. Tap Download. Tap the Menu icon. Tap Downloads. Tap the "adguard.apk" file. Tap Install. Open AdGuard. Tap Continue. Tap Block them. Select your privacy level. Tap Hide Them. Tap the "x" icon to close the ad. Tap the toggle switch .