There are a lot of antivirus apps out there, and a lot of them basically do the same thing. They protect your device from infected apps and files.
They won’t really protect your browsing or anything like that, but on Android there’s almost no chance of getting a virus from routine internet browsing. You’ll need to actually download something. That’s where the antivirus apps come in handy. If you download a lot, they can help give you peace of mind that your device is secure. All the big name PC antivirus companies, like Avast and Avira, have mobile security suites, so just pick the one you’d like to support.
Beware Unknown Sources
If you’ve ever checked the “allow installation of apps from unknown sources” option in your Settings app and installed apps from unauthorized sources, you may want to reconsider that.
Apps installed from sources other than Google Play can be injected with malicious code or simply replaced altogether with viruses that can infect your device and steal your personal data, cause problems, and more. Make sure that when you’re installing apps, you always do so from official sources only.
If you’re worried about this, just open your Settings app, tap on your Security menu, and make sure that the “Unknown Sources” option is unchecked. This will cause Android to automatically block any installation that’s not from Google Play.
If you use the Amazon app store, you can probably feel pretty confident that those apps are secure, but you’ll have to leave “Unknown Sources” checked, so just be sure to not install any random .APK files from other sources.