Non-disclosure agreement (NDA)
In short
A non-disclosure agreement (NDA) is a contract where you agree not to share a company's confidential information, often signed before an interview take-home task or on your first day of work.
Some employers ask candidates to sign a limited NDA before sharing a take-home assignment that involves real product or business details. Read what it actually restricts and for how long — a reasonable NDA is scoped to the specific materials shared, not a blanket ban on ever discussing your general skills or unrelated future work.