A custom GPT is an instance of ChatGPT that behaves how you instruct it to—i.e., to do specific jobs or take on a particular role. For example, you can instruct a custom GPT meant for exam prep to not give direct answers but instead provide hints or guidance until students arrive at an answer themselves. You can also tell it to draw information from materials you upload (like your syllabus or lecture notes). The result is a customizable digital tutor your students can use to get study help or other forms of support.