Pictograms have been in use since the early days of mankind. They are often seen as the first expressions of a written language. Some non-literate cultures still use them today as their main medium of written communication.
The design industry is undergoing a huge transformation?—?we are seeing more prototyping tools than ever before. This increase in the number and breadth of various prototyping tools is fueled by three factors: 1) the rise in mobile apps; 2) the rise of the importance of design; and 3) users expectations for well designed and intuitive applications.