It provides a unified interface to enable and fine-tune Windows security features.
It can be used as an extra layer of defense against malware attacks, after the firewall and before antivirus software.
[1] The final edition of Windows that supported EMET was version 1703 (Creator's Update).
Microsoft then changed the coding in the Fall Creator's Update of Windows 10, so it no longer supported EMET.
Microsoft has announced that EMET will reach end of life on July 31, 2018.