Insider trading involves trading a public company's stock using nonpublic information. It can provide some market benefits like faster information dissemination, but it ultimately gives insiders an unfair advantage over uninformed traders. While research-based trading is legal, trading on insider information is not. Insider trading thrives on opacity and prevents stock prices from accurately reflecting company information. It is now considered a criminal offense under Pakistani law due to the unfairness and market inefficiencies it creates.