IP whitelisting is a security practice where access to a system, network, or service is restricted to a predefined list of trusted IP addresses. Only users or devices from these specified IP addresses are allowed to connect to the protected resources, while all others are blocked by default.

IP whitelisting is commonly used to secure web applications, cloud services, and remote access solutions. It is especially useful for limiting access to internal systems or services that should only be accessed from certain trusted networks, such as a corporate office or a specific group of employees. However, IP whitelisting has limitations as it does not account for mobile devices, dynamic IP addresses, or users working from different locations, making it less flexible for remote or dynamic environments.