Why do people say "no problem" instead of "you're welcome"?

Have you ever noticed that people often say "no problem" when someone thanks them for something? It's almost become a common response these days. But why is this the case? Could it be a sign of informality or a way to downplay the favor done? Or is it simply a more casual alternative to the traditional "you're welcome"? In this day and age, with language constantly evolving, it's interesting to consider the nuances behind such common phrases. What do you think is the reasoning behind people's preference for "no problem" over "you're welcome"?