Final answer:
A discussion board is a type of forum in a high school or college course that allows you to trade messages with others online.
Step-by-step explanation:
A digital forum in a high school or college course that allows you to trade messages with others online is called a discussion board. It is an online platform where students can post messages, share ideas, ask questions, and engage in discussions related to the course topics. Discussion boards are commonly used for collaborative learning, sharing resources, and communicating with classmates and instructors.
Learn more about Discussion boards in high school and college courses