An important difference is that gel polish lasts longer than regular nail polish. It is also more solid and does not damage with scratches or pieces that break off. This is due to the gel added to this nail polish. Another difference is that you have to use a UV/LED lamp for gel polish. With the help of such a lamp, each layer of gel polish is well cured, so that it stays in place better.
Gel polish lasts up to 2 weeks, where regular nail polish often starts to peel off after 2-3 days. So it saves you a lot of time and effort by choosing gel polish. And of course it immediately looks well-groomed!