Definition update 1.15.2240.5 for Windows Defender (Engine update 1.1.2204.0)
Summary:
Definitions are files that behave like an encyclopedia of known spyware and other potentially unwanted software. Because spyware is continually being developed, Windows Defender relies on up-to-date definitions to determine whether software that is trying to install, run, or change settings on the computer is potentially harmful.
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