PowerDNS is a high-performance DNS server software known for its robust security features, flexibility, and scalability. It offers both an authoritative server and a recursive DNS resolver. PowerDNS supports a variety of backends, including databases and LDAP, allowing for dynamic DNS configurations. It is widely used by enterprises and service providers due to its ability to handle high query volumes efficiently. The software is open-source, but PowerDNS also provides commercial support and services.