What is the main purpose of shading shapes in a flow diagram?

Shading shapes in a flow diagram primarily serves to clarify actions and decisions. By using shading, different elements within the diagram can be visually distinguished, which helps viewers quickly understand the flow of the process being represented. For instance, specific colors or shades may denote different types of actions or indicate whether a decision point is being illustrated, thus enhancing the overall readability and effectiveness of the diagram. This visual differentiation is crucial in complex diagrams where clarity is necessary for the audience to grasp the intended meaning and sequence of operations efficiently.