Visualization can refer to

in technology:

• Visualization (graphic), as in any technique for creating images, diagrams, or animations to communicate any message.
• Scientific visualization, an application of computer graphics which is concerned with the presentation of potentially huge quantities of laboratory, simulation or abstract data to aid cognition, hypotheses building and reasoning
• Knowledge visualization, a sub discipline of Information Design and Instructional Message Design.
• Product visualization, visualization software technology for manufacture of components and large assemblies of products.
• Music visualization, a feature found in some media player software applications.

in psychology:

• The process of creating internal mental images (internal visualization and imagination)

Visualisierung (allgemein) | Visualización | Vizualizacija