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A confidential relationship can also be created through an oral agreement or can be implied from the conduct of the parties, but few people rely on such informal arrangements because they are always more difficult to prove than a relationship based on a written agreement.
NDAs are often categorized as either "mutual" or "one-way." A mutual NDA is one in which both parties are exchanging confidential information -- for example, you provide secret information for a company to evaluate and they provide you with secret information about their marketing strategy. A one-way agreement is used when only one party is making a disclosure -- for example, when you explain your secret to a contractor or investor.