Threat Prevention scans files on systems in two ways, such as on-access and on-demand.
On-access scan — Scans files and folders for malware threats and unwanted programs whenever you access them, and takes actions according to the configuration. You can apply the scan process types such as Standard, High Risk, and Low Risk processes for on-access scanning.
On-demand scan — Scans files and folders for malware threats and unwanted programs at any time or at scheduled time. You can run on-demand scan in two ways.
Scan all files — Scans files and directories immediately for the locations you have selected in What to Scan.
Schedule Scan — Scans files and directories configured in What to Scan at the scheduled time.