VPN stands for Virtual Private Network, which is a service designed to provide secure internet access over public networks, often used for privacy purposes. However, there are no VPNs that specifically block access to the internet. Instead, there are other tools and services that can block access to certain websites or services. These tools, such as blockers or traffic managers, are not VPNs but are designed to restrict access to specific resources. Therefore, while there are no VPNs that can block internet access, there are general-purpose tools that provide similar functionality.