Google sheets only allows sharing the whole spreadsheet. If you want to share a single sheet, you either use publish to web or import range as workarounds.  However, these workarounds has significant limitations. For example,  Importrange will allow you to only specify rows (1:1000) or columns (A:Z) without a sheet, you can uncover the first tab of an imported workbook.

Sheet Share helps you share individual sheet/tab without exposing the whole spreadsheet. What's more, Sheet Share supports editing sheet content at either side and synchronise the editing instantly.