Why is this necessary?

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There are several goals that the hover effect can help achieve:

Emphasize attention – highlight a button, an interactive element. Such a detail will allow the user to navigate faster – if the element reacts, then you can click on it and something will happen. This is a way to ensure that the visitor does not miss important details.
Inform – give a hint, help to understand the action. A hover can be a pop-up text or a picture with instructions. This technique will be successful for primary training instructions in applications. It is also an ideal solution for situations when too many explanations will clutter up a page or form.

Keep the user on the site - let him play with different details. If you insert interesting Easter eggs and make different elements animated, then the visitor will simply be interested in what will happen when vietnam telegram hovering. As a result, he not only increases traffic, but also has the opportunity to examine the site details in more detail, find something interesting for himself and, ultimately, perform a conversion action. Implementing such things takes time and imagination. But you develop it once, and thousands of visitors will spend many times more time on the page than without hover.

Liven up the design – if there is no other animation, video, gifs or other interesting effects, then a static site can easily be transformed with a hover effect. It may not have other meanings and be used exclusively for decoration. But who said that aesthetics are not important? Interactivity is almost a necessary criterion for a good site today.
Structure the site – highlighting individual elements will help to view them more conveniently. For example, enlarge the window with tariffs for the service. Or highlight the rows/columns of the table. A small thing that will help to win over the user, because everything is convenient and clear to him.