Pi-hole is a network-wide ad blocker that acts as a DNS sinkhole. It intercepts DNS queries and blocks requests to known ad-serving domains, improving browsing speed and security by preventing ads, trackers, and malicious content from loading.

Unbound is a DNS resolver that securely queries DNS records from authoritative servers. It can be used with Pi-hole to enhance its functionality by providing fast, privacy-respecting DNS resolution, often improving performance and security. When configured with Pi-hole, Unbound serves as a local recursive resolver to fetch domain information directly, bypassing third-party DNS services.

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