What is the Id attribute for?

Hi. I’m doing my first Web design lesson where I need to create a radio button. I need to add an id attribute to it which I did but I don’t quite understand its purpose. I googled it and it says that it is a unique identifier. But it does not make the specified text bold or italic like or . So what is it for? I don’t understand its purpose even when I see examples with the Outputs just because I don’t understand what exactly was supposed to change with the addition of this attribute.

the id is a way to uniquely identify an element.

This can be used for styling, or to select the element with JavaScript.