Question: How to combine multiple files into one spreadsheet

My co-worker have multiple Excel files (1 worksheet per file); all worksheets have the same column headers and structure; she needs to combine all these worksheets from the multiple files into one worksheet with all the data stacked one below the other.

Please help if you know of an easy way to do this.

If would be great if you could provide a macro code and instruction on how to use the macro.