Pi-hole is a Linux network-level advertisement and Internet tracker blocking application[3][4] which acts as a DNS sinkhole[5] and optionally a DHCP server, intended for use on a private network.

[1] It is designed for low-power embedded devices with network capability, such as the Raspberry Pi,[3][6] but can be installed on almost any Linux machine.

[11] Pi-hole makes use of a modified dnsmasq called FTLDNS,[13] cURL, lighttpd, PHP and the AdminLTE Dashboard[14] to block DNS requests for known tracking and advertising domains.

[16] Integrating Pi-hole with a VPN allows users to extend ad-blocking and tracker-blocking capabilities to devices outside their local network, providing consistent protection while on the go.

[7] Additionally, it can enhance security by blocking malicious domains and phishing attempts, reducing the risk of malware infections on connected devices.