'stopPropagation()' and 'preventDefault()' are both methods used to control the behavior of events in JavaScript, but they have different purposes.
'stopPropagation()' is a method that stops the propagation of an event through the DOM, preventing it from reaching any other elements.
This can be useful when you want to prevent parent elements from handling the same event.
'preventDefault()' is a method that prevents the default behavior of an event from occurring.
For example, if you have a link ('<a>') element with an 'onclick' event handler, calling 'preventDefault()' will prevent the link from being followed when clicked.
Both 'stopPropagation()' and 'preventDefault()' can be called within an event handler function to control how events are handled.
Overall, 'stopPropagation()' is used to stop the event from bubbling up the DOM, while 'preventDefault()' is used to prevent the default behavior of an event.