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What is Pi-Hole? and how does it work? Pi-hole is open-source software that acts as a DNS sinkhole to protect your devices from unwanted content, without the need for any client-side software like apps or browser plug-ins. PiHole blocks ads using blocklists which check against a database of known ad serving domains. This way, it blocks ads not only in browsers, but also mobile apps and smart TVs — and it makes your network faster!