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Domain Name System (DNS)

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descriptionDomain Name System that maps human-readable domain names to technical records such as IP addresses and other resource data.
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DNS stands for Domain Name System.

It is the hierarchical naming system that maps human-readable domain names to technical records such as IP addresses and other resource data.

What it does​

DNS helps software locate internet resources by name instead of by raw numeric address.

It is commonly used to:

  • Resolve domain names to IP addresses
  • Route websites and services to the right destination
  • Publish mail and verification records
  • Support service discovery and infrastructure configuration
  • Connect domains to hosting and network platforms

Core concepts​

Name resolution​

The most familiar role of DNS is translating a domain name into the address a system needs to reach.

That lookup process is fundamental to how websites and internet services work.

Record types​

DNS stores different types of records for different purposes.

Examples include records for web traffic, email handling, verification, and policy publication.

Distributed system​

DNS is decentralized and hierarchical rather than one single global database.

That is why propagation, caching, and delegation matter so much operationally.

Common use cases​

  • Connecting a domain to a website
  • Pointing subdomains to services
  • Publishing email-related records
  • Configuring CDN, security, and hosting platforms
  • Managing traffic at the domain layer

Practical notes​

  • DNS is not only about websites; it also supports email, verification, service routing, and other infrastructure behavior.
  • Changes to DNS can take time to propagate because of caching.
  • DNS issues often look like hosting or app issues even when the real problem is domain-layer configuration.
  • DNS is closely tied to Cloudflare, hosting, and internet-facing services.

Sources Used​

Frequently Asked Questions​

Is DNS only for websites?​

No. It is also used for email, verification, service discovery, and many other internet-facing functions.

Why do DNS changes sometimes take time?​

Because DNS responses are cached at multiple layers, and those caches expire on different schedules.

Is DNS the same as hosting?​

No. DNS points names to destinations, while hosting is where the service or site actually runs.