what is the html tag to underline a text??

Answer 1

You could use the HTML <u> tag, but it's better to use a CSS attribute for underlining text:

text-decoration: underline

Answer 2

<ins>text</ins>

Answer 3

thanks but is there any difference between <u> and <ins> tags?

Answer 4

Similar to other HTML tags, it helps document what you meant when you developed the script.

The <ins> tag marks text added later on to the original text and <u> marks text with a different formatting.