Visio

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Work visually. Diagramming made simple.

Visio makes it easy and intuitive to create flowcharts, diagrams, org charts, floor plans, engineering designs, and more, using modern shapes and templates with the familiar Office experience.

Work together on Visio flowcharts to include insights from all stakeholders. And with Office 365 multiple team members can work on diagrams at the same time. Connect your flowcharts and diagrams to real-time data. Applied shape formatting automatically updates your flowcharts to reflect changes in the underlying data, either in Visio or through Office 365.

Snippet from Wikipedia: Microsoft Visio

Microsoft Visio ( VIZ-ee-oh) (formerly Microsoft Office Visio) is a diagramming and vector graphics application and is part of the Microsoft Office family. The product was first introduced in 1992, made by the Shapeware Corporation. It was acquired by Microsoft in 2000.