Microsoft Graph Security refers to a subset of security-specific APIs in Microsoft Graph. Prior to release, this had previously been referred to as the "Intelligent Security Graph". This tag should generally be used in conjunction with the [microsoft-graph] tag.
The Microsoft Graph Security API describes a security-specific API connected to the Microsoft Graph that provides standard interface and schema with security solutions from Microsoft and partners.
It allows for easier integration with security solutions as well as connects to the business context from other Microsoft Graph entities.
You can use this API to build solutions that authenticate once through Microsoft Graph and make a single API call to access or act on security insights from multiple sources.