A broadband fair usage policy is a set of guidelines established by internet service providers to ensure that their network resources are used fairly and efficiently by all customers. The policy typically specifies the amount of data that can be used by a customer within a specific time period, such as a month, before the provider may reduce the customer's internet speed or charge additional fees.

The purpose of a fair usage policy is to prevent excessive or abusive usage of the network that can negatively affect other customers' experience. It's important to note that fair usage policies are not intended to limit a customer's internet usage but rather to encourage responsible use of the network. The exact terms of a fair usage policy can vary depending on the provider and the specific broadband plan, so it's essential to read and understand the policy before you sign up for a new broadband service.