Respondus Lockdown Browser is a tool that adds a layer of security to your quizzes and exams by locking out external tools in order to reduce cheating.
Lockdown Browser reduces cheating in the following ways:
disabling videoconferencing tools such as Zoom and Microsoft Teams
disabling remote support tools
by locking the student inside the browser to prevent browsing to other sites
Here is a video showcasing the basics of Respondus Lockdown Browser.