In spreadsheet software such as Microsoft Excel, Google Sheets, and others, you can join two or more cells by using the "Merge Cells" option. This option is typically found in the "Home" or "Format" tab on the ribbon, and once selected, you can choose which cells to merge. Once the cells are merged, the contents of the cells will be concatenated together and appear in the first cell of the selected range, other cells will be deleted.
Additionally, you can also use the CONCATENATE or "&" operator to join the contents of two or more cells together. The CONCATENATE function is used to combine the contents of multiple cells into one cell, while the "&" operator is used to concatenate the contents of two or more cells together.
It's worth noting that when merging cells, the data in the cells that are being merged will be lost except the data in the first cell of the selected range. Therefore, it's important to make sure you have copied or saved the data that you want to retain before merging the cells.