Final answer:
The plan summary grid summarizes billing information such as costs of plans, billing frequency, and discounts; it visualizes this data with color-coded bars and numbers.
Step-by-step explanation:
The plan summary grid is a visual representation often used in the business field to summarize billing information. Typically, such a grid will capture important data points such as the costs associated with different plan options, the frequency of billing, and perhaps any discounts or special offers that apply. The visualization through darker blue numbers and lighter blue bars can help to easily compare and contrast the different components of each plan, with font in black providing clear legibility of the information included.