Are redundant close buttons on an auto-closing popup necessary?

1. Should a modal have a close button?
2. What is the purpose of close button?
3. Where should the close button be placed?
4. What is the difference between cancel and close button?

Should a modal have a close button?

Closing the modal: Always provide a clear close option for users by using a button or an 'x' icon at the top right of the modal.

What is the purpose of close button?

(eXit button) Also called a "close" or "exit" button, clicking or tapping the X removes the current window, dialog box or popup message from the screen. It is also used to delete text and graphics.

Where should the close button be placed?

The upper right corner of a modal window is the common place for the close button X in desktop experience.

What is the difference between cancel and close button?

Presenting two distinct buttons: X for closing the view (with the side effect of saving intermediate work) and Cancel for abandoning the process.