It does just one thing it cleans up existing malware problems. In particular, the free edition, reviewed here, doesn't include any real-time protection.

If you let the trial expire without upgrading, you'll find that you lose quite a few features. When you install the free edition, you can choose a 14-day trial of Malwarebytes Premium. Version 2 came out a couple years before that. The release of version 4 in 2019 was the first whole-number update since version 3 in 2016. While many security companies release product updates every year, Malwarebytes only does so when necessary. It can't help with attacks that do permanent damage, such as ransomware, but it's a handy tool when other approaches fail. Malwarebytes Free exists to wipe out attackers that get past your main defenses or that already compromised your PC before you could install protection. Or you might have an existing malware infestation that prevents installation of any full-scale antivirus. Some zero-day innovative malware attack might elude your protection, and then disable it. People write software, including antivirus software.

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Free malwarebytes scanner