Malware is malicious software that is not categorized as a virus. Most antivirus software will not detect malware and cannot remove it as a result. This could result in pop ups asking you to call a number all the way to data theft.
Though the antivirus software are being updated to detect and remove malware, they are not yet that great at it. That is where Malwarebytes comes in. Malware bytes is anti malware software that does a stellar job at detecting and removing malware from your system.
You can get a free version or a paid version of the software. The only difference is the paid version has real time protection so you don’t have to run a scan. The free version works just as well and I recommend scanning once every few weeks.