Visual Programming (VP) refers to any system that allows the user to specify a program in two-(or more)-dimensionsional fashion. [...] conventional textual languages are not considered two dimensional since the compilers or interpreters process them as long, one-dimensional streams.
A visual Language manipulates visual information or supports visual interaction, or allows programming with visual expressions. The latter is taken to be the definition of a visual programming language. Visual programming languages may be further classified according to the type and extent of visual expression used, into icon-based languages, form-based languages and diagram languages. Visual programming environments provide graphical or iconic elements which can be manipulated by the user in an interactive way according to some specific spatial grammar for program construction.
A visual language is a set of spatial arrangements of text-graphic symbols with a semantic interpretation that is used in carrying out communication actions in the world.