Cyber crime refers to illegal activities carried out using computers or the internet. This document outlines the history and categories of cyber crime, including hacking, virus attacks, and software piracy. It discusses trends in Bangladesh, such as the Bangladesh Bank heist of 2016, and effects globally like the loss of intellectual property and damage to reputation. The document provides tips for cyber crime prevention, including updating passwords and security software. It also describes cyber law in Bangladesh, which recently increased penalties for cyber crimes.