An Excel Table is not just any range of data with headings, but a specific Excel object that unlocks additional properties. Contrary to a random set of data, Tables work as a whole, something that can be very useful and make your Excel spreadsheet much easier to use, share, and update.
By default, Excel tables have a very distinctive appearance, with blue banded rows. However, this format can be changed so it doesn’t guarantee you actually have a Table. But you can know you have an Excel Table when you select a cell and the Design tab shows up on the ribbon