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To activate hover effect utilizing JavaScript, you can use the following steps:

1. Get the HTML element where you want to activate the hover effect.

2. Add an event listener to the element for the 'mouseenter' event (which occurs when the mouse cursor enters the element).

3. In the event listener function, add the CSS styles you want to apply for the hover effect using the style property.

4. Add another event listener for the 'mouseleave' event (which occurs when the mouse cursor leaves the element).

5. In the second event listener function, remove the CSS styles added in the first event listener function using the style property.

6. Here's an example of how to activate hover effect using JavaScript:

var element = document.getElementById('my-element');
element.addEventListener('mouseenter', function () {
  element.style.backgroundColor = 'red';
  element.style.color = 'white';
});
element.addEventListener('mouseleave', function () {
  element.style.backgroundColor = '';
  element.style.color = '';
});

In this example, the CSS styles for background color and text color are added when the mouse cursor enters the element, and removed when it leaves the element. You can modify the CSS styles based on your requirement.