Can you describe what an Excel Array Formula does and give an example of its use?

Certainly, I'm glad to address this question regarding Excel Array Formulas, a powerful feature in Excel that I have utilized extensively in my roles, particularly as a Data Analyst. Array Formulas are designed to perform multiple calculations on one or more of the items in an array, which can then return either a single result or multiple results. They are incredibly efficient for complex calculations across large datasets, allowing for a streamlined and sophisticated analysis process.

For example, let's consider we're working with a dataset that contains daily sales figures for multiple products over a period of a month...