Virus removal tools can be standalone one-time scanners or built into full antivirus software. They scan your system for malicious files and remove them. Standalone tools are great as a second opinion ...
Generally, you don’t need an antivirus app on your Android phone if you play it safe, only download apps from the Play Store, and keep your security settings enabled. However, some like to take a walk ...
TL;DR: To combat the rising threat of sideloaded Android malware, Google Play Protect has introduced an additional layer of security. Now, before you install an app, it will prompt you to scan it.