Welcome to the “Cybersecurity Toolkit,” a series of video lessons designed to cover everything you need to know about keeping your workplace safe from cyberattacks. This lesson, “Cybersecurity: Insider Threats,” describes how to avoid and detect insider threats. In this lesson, viewers will first learn what an “insider” is and how they can be malicious or unintentional. Then, the learner will be presented with five action steps on how to prevent insider threats, followed by three action steps on how to detect these threats as soon as possible. Keywords: cyber security, cyber-security