Yes, Microsoft Visio and Project are compatible with Office suites but are not included and must be purchased separately. They complement Office applications like Word, Excel, and PowerPoint and can be installed on the same computer alongside these. Pay attention to compatibility regarding version (year) and 32-bit or 64-bit.
Example 1: Visio 2013 Prof Plus with Office 2016 Prof Plus -> not compatible, so both programs cannot be used simultaneously on one system.
Example 2: Visio 2013 Prof Plus with Office 2013 Prof Plus -> compatible, both programs can be installed and used on one system without any problems.