These are used widely in various fields for various purposes. These symbols represent specialized pieces of diagrams such as process flow diagrams, business process modeling, data flow diagrams, and many more. Visio includes a big library of shapes/symbols used in dozens of diagram types. If appropriate for your needs, Visio can indeed produce slick, useful diagrams of all types, and these can provide the professional look you want for presentations, reports, audits, building plans, floor plans, documentation, and modeling better ways to do things.

(More on that at the end of this article.) Or you could use software that is free or less expensive but still powerful, such as, which also works on Macs. Given Visio’s cost, a hand-drawn diagram may suit your purposes, or you might turn to the basic diagram functions in MS Word. Visio can be used in a variety of settings to create professional-looking diagrams.