VPLs may be further classified, according to the type and extent of visual expression used, into icon-based languages, form-based languages, and diagram languages. For example, many VPLs (known as dataflow or diagrammatic programming) are based on the idea of "boxes and arrows", where boxes or other screen objects are treated as entities, connected by arrows, lines or arcs which represent relations. A VPL allows programming with visual expressions, spatial arrangements of text and graphic symbols, used either as elements of syntax or secondary notation. In computing, a visual programming language ( VPL) is any programming language that lets users create programs by manipulating program elements graphically rather than by specifying them textually. KTechlab uses flowcharts to program microcontrollers graphically.
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