What is a macro in Excel?

A macro in Excel is a powerful feature that allows users to automate repetitive tasks within their spreadsheets. By recording a sequence of actions, such as formatting cells, entering formulas, or manipulating data, a macro can be saved and then run automatically. This not only saves time for users who often perform the same operations but also reduces the likelihood of errors that can occur with manual input.

When you create a macro, you're effectively creating a mini-program that executes specific commands. This capability is particularly beneficial for tasks that require consistency and speed, enabling users to focus on more complex analysis rather than getting bogged down by routine actions. The ease of running a macro allows for streamlined workflows, especially in data processing and management scenarios.

The other options relate to Excel functionalities but do not define a macro. Formulas are used to perform calculations and analyze data, charts are graphical representations of data, and review tools are utilized for tracking changes in a spreadsheet, none of which encompass the automation aspect that defines a macro.