JavaScript allows you to dynamically create, remove, or replace HTML elements (nodes) in the DOM. These operations are useful when building interactive applications that update the page without reloading it.

You can create a new element using document.createElement() and then append it using appendChild().

Use insertBefore() to insert a new node before an existing child node.

parent.insertBefore(newNode, existingNode)

You can remove an element using element.remove().

To remove a specific child node, use parent.removeChild(child).

You can replace an existing child node with another using parent.replaceChild(newNode, oldNode).