Exit application without closing all the files

I am trying to provide an option to my users to save and close excel application after they finish to complete a specific form. However, it is closing the whole Excel and not only the current Excel workbook that they just used. In other words, if they have 4 different Excel files opened, it will close all of them and not only the current workbook. What am I doing wrong?
This is the code that I am using:

ThisWorkbook.Application.Quit
    ThisWorkbook.Save

>Solution :

You must not quit the Application – but close the workbook:

ThisWorkbook.Close SaveChanges:=True

will save and close the workbook.

If it is the only open workbook, Excel gets closed as well.
If not Excel and the other workbooks are still open.