What's the “for” for in a label tag?

Question

Just ran across a for parameter in an HTML label tag:

 First Name 
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Answer 1

From w3schools.org:

The tag defines a label for an input element.

The label element does not render as anything special for the user. However, it provides a usability improvement for mouse users, because if the user clicks on the text within the label element, it toggles the control.

The for attribute of the tag should be equal to the id attribute of the related element to bind them together.

HTH!

adding my $.02 as an Accessibility SME - as well as usability, the LABEL also associates the input field with the correct label so persons using screen readers will know what the field is for.