Is day trading illegal?

Excuse me, could you clarify something for me? I've been hearing conflicting information about day trading and whether or not it's considered illegal. I understand that it involves buying and selling financial instruments, such as stocks or cryptocurrencies, within a single trading day, with the aim of profiting from short-term price fluctuations. But is this practice inherently illegal, or does it depend on the specific circumstances and regulations in different jurisdictions? Could you please elaborate on this and provide some clarity?