Which of the following is an example of data visualization?

Data visualization refers to the graphical representation of information and data, allowing for easier comprehension of complex data through visual elements like graphs, charts, and maps. The example of a graph showing sales trends over time stands out because it transforms raw data—such as sales figures—into a visual format that illustrates patterns, trends, and changes over a specified period. This makes it much easier for stakeholders to identify trends and make data-driven decisions at a glance.

In contrast, a spreadsheet with numerous data points primarily organizes data in a tabular format without any graphical representation, making it challenging to interpret at a glance. A database of customer information is focused on storing data rather than visualizing it, and an email summarizing sales results, while it may present information, does not employ visual tools to enhance understanding. Therefore, the graph effectively encapsulates what data visualization aims to achieve by providing an intuitive visual interpretation of the data.