Is it better to save changes onblur of an edited field or to provide the user with save and discard changes buttons?

1. Why we use onblur?
2. What does onblur mean?

Why we use onblur?

The onblur attribute fires the moment that the element loses focus. Onblur is most often used with form validation code (e.g. when the user leaves a form field). Tip: The onblur attribute is the opposite of the onfocus attribute.

What does onblur mean?

Definition and Usage

The onblur event occurs when an HTML element loses focus. The onblur event is often used on input fields. The onblur event is often used with form validation (when the user leaves a form field).