What is hover and how to use it ?

Question

Please give me a suitable answer.

Answer 1

thats some action thats triggered when you put your mouse on element
<button> Click </button>

css
button {
background-color: grey;
}

/*putting your mouse on button changes background color*/
button:hover {
background-color: black;
}

it can be use for a lot of elements: button, input, anchor...