A tooltip is visible when a user moves the mouse cursor on a text. You can add information in it to make it easy for users to understand.
Example
You can try to run the following code to learn how to create tooltip −
<!DOCTYPE html>
<html>
<style>
#mytooltip #mytext {
visibility: hidden;
width: 100px;
background-color: black;
color: #fff;
text-align: center;
border-radius: 3px;
padding: 10px 0;
position: absolute;
z-index: 1;
}
#mytooltip:hover #mytext {
visibility: visible;
}
</style>
<body>
<div id = "mytooltip">Hover the mouse over me
<p id = "mytext">My Tooltip text</p>
</div>
</body>
</html>