In JavaScript, scroll events are events that are triggered when a user scrolls on a webpage. These events can be used to handle user scrolling and perform actions based on the specific element that was scrolled.

There are two common scroll events in JavaScript:

• scroll: This event is triggered when a user scrolls on a webpage, regardless of the element that was scrolled.
• scrollstart: This event is triggered when a user begins scrolling on a webpage.

Here is an example of using scroll events in JavaScript:

// Select the body element on the page
var body = document.querySelector('body');

// Add a scroll event listener to the body element
body.addEventListener('scroll', function(event) {
  // Handle the body element being scrolled
  console.log('Body element scrolled');
});

// Add a scrollstart event listener to the body element
body.addEventListener('scrollstart', function(event) {
  // Handle the body element starting to be scrolled
  console.log('Body element scroll started');
});

In this example, we are adding scroll event listeners to the body element on the page. When the user scrolls on the page, the corresponding scroll events are triggered and handled in the event listeners. This allows us to perform actions based on user scrolling on the page.