How to use require field in bootstrap form?

How to use require field in bootstrap form?
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Today I will tell you how to use require field in your form.

First of all I will tell your what is require field? Require field is whenever I will require tag in our input field and finally hit at submit button, if your input field is not fill up you cant go ahead. A tooltip will show below your input field  where will write (Please fill in this field)

<form>
<input type="text" required="required">
<button>Submit</button>
</form>

Please see the image below. It will look like same, when you hit at submit button.