HTML Datalist Form Element | Datalist input element | datalist tag in html

The HTML datalist tag is used to provide an auto-complete feature on the form element. It provides a list of predefined options to the users to select data. The datalist tag is introduced in HTML5. The datalist tag should be used with an input element that contains a "list" attribute.

what is datalist?.
where we are used datalist?.
how to use the datalist?.
how to create datalist dropdown?.