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+.. highlight:: none
+.. _Introduction:
+
+************
+Introduction
+************
+
+What is Knot DNS
+================
+
+Knot DNS is a high-performance open-source DNS server. It
+implements only the authoritative domain name service. Knot DNS
+can reliably serve TLD domains as well as any other zones.
+
+Knot DNS benefits from its multi-threaded and mostly lock-free
+implementation which allows it to scale well on SMP systems and
+operate non-stop even when adding or removing zones.
+
+The server itself is accompanied by several utilities for general DNS
+operations or for maintaining the server.
+
+For more info and downloads see `www.knot-dns.cz <https://www.knot-dns.cz>`_.
+
+Knot DNS features
+=================
+
+DNS features:
+
+* Primary and secondary server operation
+* Internet class (IN)
+* DNS extension (EDNS0, EDE)
+* TCP and UDP protocols
+* Zone catalog generation and interpretation
+* Minimal responses
+* Dynamic zone updates
+* DNSSEC with NSEC and NSEC3
+* ZONEMD generation and validation
+* Transaction signature using TSIG
+* Full and incremental zone transfers (AXFR, IXFR)
+* Name server identification using NSID or Chaos TXT records
+* Resource record types A, NS, CNAME, SOA, PTR, HINFO, MINFO, MX,
+  TXT, RP, AFSDB, RT, KEY, AAAA, LOC, SRV, NAPTR, KX, CERT, DNAME, APL, DS,
+  SSHFP, IPSECKEY, RRSIG, NSEC, DNSKEY, DHCID, NSEC3, NSEC3PARAM, TLSA, SMIMEA,
+  CDS, CDNSKEY, OPENPGPKEY, CSYNC, ZONEMD, SVCB, HTTPS, SPF, NID, L32, L64, LP,
+  EUI48, EUI64, URI, CAA, and Unknown
+
+Server features:
+
+* IPv4 and IPv6 support
+* Semantic zone checks
+* Server control interface
+* Zone journal storage
+* Persistent zone event timers
+* YAML-based or database-based configuration
+* Query processing modules with dynamic loading
+* On-the-fly zone management and server reconfiguration
+* Multithreaded DNSSEC zone signing and zone validation
+* Automatic DNSSEC key management
+* Zone data backup and restore
+* Offline KSK operation
+* PKCS #11 interface
+
+Remarkable module extensions:
+
+* Response rate limiting
+* Forward and reverse records synthesis
+* DNS request traffic statistics
+* Efficient DNS traffic logging interface
+* Dnstap traffic logging
+* Online DNSSEC signing
+* GeoIP response tailoring supporting ECS and DNSSEC
+
+Remarkable supported networking features:
+
+* TCP Fast Open (client and server)
+* High-performance UDP and TCP through AF_XDP processing (on Linux 4.18+)
+* Inbound DNS-over-QUIC processing (on Linux)
+* SO_REUSEPORT (on Linux) or SO_REUSEPORT_LB (on FreeBSD 12.0+) on UDP and by choice on TCP
+* Binding to non-local addresses (IP_FREEBIND on Linux, IP_BINDANY/IPV6_BINDANY on FreeBSD)
+* Ignoring PMTU information for IPv4/UDP via IP_PMTUDISC_OMIT
+
+License
+=======
+
+Knot DNS is licensed under the `GNU General Public License <https://www.gnu.org/copyleft/gpl.html>`_
+version 3 or (at your option) any later version. The full text of the license
+is available in the ``COPYING`` file distributed with source code.