What Is an NDA? Non-Disclosure Agreements Explained
A non-disclosure agreement (NDA) is a contract in which one or both parties promise to keep certain information confidential. It is the standard way to share sensitive details — a product idea, customer list, or financials — with someone outside your company without it leaking.
This guide explains what an NDA covers, the difference between one-way and mutual NDAs, and the clauses that make one actually enforceable.
One-way vs mutual NDAs
A one-way (unilateral) NDA protects information flowing in a single direction — for example, when you disclose a plan to a contractor who has nothing confidential to share back.
A mutual (bilateral) NDA protects both sides and is standard when two companies explore a partnership, since each will reveal sensitive information. Pick the one that matches who is actually sharing secrets.
What a solid NDA includes
Whatever the direction, a usable NDA defines a few things clearly:
- The parties — who is bound by the agreement.
- A definition of "confidential information" — specific enough to be meaningful.
- Exclusions — what is not covered (e.g. already-public information).
- Permitted use — what the receiving party may do with the information.
- The term — how long the duty of confidentiality lasts.
- What happens on breach, and return or destruction of materials.
When you actually need one
Use an NDA before sharing anything that gives you an edge and is not already public: pre-launch product details, source code, pricing, customer data, or unfiled inventions. Sign it before the conversation, not after.
An NDA is not a substitute for good judgment — don't share more than the other side needs — but it gives you a clear legal remedy if confidential information is misused.
Frequently asked questions
Is an NDA legally binding?
Yes, a properly drafted and signed NDA is an enforceable contract. Enforceability depends on it being reasonable in scope, duration and the information it protects.
How long does an NDA last?
The term is whatever the parties agree — often two to five years, though trade secrets can be protected for as long as they stay secret. State the duration explicitly.
What is the difference between an NDA and a confidentiality agreement?
They are essentially the same thing — "NDA" and "confidentiality agreement" are used interchangeably for a contract that protects private information.
Can I write an NDA myself?
Yes. A straightforward NDA can be generated from a template by filling in the parties, the information covered and the term. PaperKit's NDA generator does this in a few minutes.