Macros in Excel are like mini-programs you can create to automate repetitive tasks. They essentially record the steps you take and then play them back whenever you want, saving you time and effort.

Here's how macros work:

1. Recording a Macro:
- Go to the "View" tab and click "Macros" in the ribbon.
- Choose "Record Macro" to start recording your actions.
- Give your macro a clear and descriptive name for easy identification later.
- (Optional) Assign a shortcut key for quick macro execution.
2. Perform the Task: Now, perform the repetitive task you want to automate. This could be anything from formatting cells, copying and pasting data, to complex calculations involving multiple steps. Excel records every keystroke, mouse click, and menu selection you make.
3. Stop Recording: Once you've finished the steps, click the "Stop Recording" button in the "Macros" tab.

Now you have a macro that remembers the entire sequence!

Using Your Macro:

1. Run the Macro: There are several ways to run your macro:
- Go to the "View" tab and click "Macros" again. Select your macro name and click "Run."
- Assign a shortcut key during recording for quicker access (press the assigned key combination).
- You can even create macro buttons on the Quick Access Toolbar or customize the ribbon for one-click execution.

Benefits of Macros:

- Save Time: Automate tedious, repetitive tasks to free yourself up for more analytical or creative work.
- Reduce Errors: By replacing manual steps with a macro, you eliminate the possibility of human error during repetitive actions.
- Increase Consistency: Macros ensure tasks are performed exactly the same way every time, leading to consistent formatting and calculations.

Things to Consider:

- Complexity: While macros can be simple, for very complex tasks, it might be better to learn VBA (Visual Basic for Applications), the programming language behind macros, for more granular control.
- Security: Be cautious with macros from untrusted sources, as they could potentially contain malicious code.

Overall, macros are a powerful tool in Excel that can significantly improve your efficiency and accuracy when dealing with repetitive tasks.