An exclusivity clause in an NDA restricts one or both parties from engaging in certain activities with third parties for a specified period. While NDAs are typically designed to protect confidential information, an exclusivity provision goes a step further by limiting your ability to collaborate, negotiate, or transact with others in the same field or regarding similar projects.
For example, a software developer may be barred from working with competitors of the company they signed the NDA with, even if the information shared is unrelated to those competitors.