# Graphical Components and Mapping Strategies

This section discusses:
• Graphical components i.e. individual components of graphs
• Mapping strategies i.e. mapping between data and graphics
It is important to know about graphical components and mapping strategies because it helps to:
• evaluate visualizations: with an in-depth understanding of the above, we will be able to criticise design choices
• re-design evaluations
Visual Encoding refers to the strategies/rules used to turn data into graphical representations. More precisely, it refers to the mapping between:
• data items
$\leftarrow\rightarrow$
visual marks
• data attributes
$\leftarrow\rightarrow$
visual channels