DNS
DNS: The Domain Name System, or DNS, maps human-readable domain names to records used to locate and configure internet services.
What DNS means
The Domain Name System, or DNS, maps human-readable domain names to records used to locate and configure internet services. For web browsing, DNS commonly resolves a domain to an IP address before the browser connects to the web server. DNS also supports records for mail and other services.
On production websites, the term is usually encountered as part of the browser–server model: documents and assets are requested, interpreted and presented through standardized web technologies. Correct use depends on the surrounding technology rather than on the term in isolation.
How it is used in web and design work
For designers and developers, understanding this concept helps clarify what belongs in content structure, presentation, behavior, networking or browser behavior. That separation makes interfaces easier to debug, optimize and maintain.
In practical work, DNS should be interpreted according to its technical or design context. The surrounding document structure, software, output medium, browser behavior or publishing workflow determines how the concept is applied. The purpose of the term is to describe a specific part of that process, not to replace the other concepts around it.
Where the term fits
Web terminology often describes one layer of a larger system. Markup defines document structure, CSS defines presentation, JavaScript supplies programmable behavior, networking protocols move resources, and the browser combines those inputs into an interactive page. Keeping those responsibilities separate is useful when tracing where a problem originates and which technology is responsible for correcting it.
When checking a web term in practice, use browser developer tools and standards-oriented documentation to identify the actual resource, request, DOM node, computed style or runtime behavior involved. A visual symptom does not necessarily identify its technical cause: an apparent layout problem can originate in markup, a network failure can prevent styling or scripts from loading, and script behavior can alter the document after the initial HTML has been parsed.
Why the distinction matters
A common source of confusion is treating related web terms as interchangeable. Web documents, browsers, servers, protocols and programming interfaces each describe different layers of the system.
Using precise terminology helps designers, developers, editors and clients describe the same problem without mixing separate layers of a project. That is especially useful when a visual issue may actually come from document structure, when a WordPress issue belongs to a theme or plugin, or when an image problem depends on resolution, color or file type rather than styling.
Related glossary terms
The following entries sit close to DNS in the same workflow or terminology set. The distinction is useful because each term names a separate concept:
Browser: A web browser is software that retrieves, interprets and displays web resources.
URL: A URL, or Uniform Resource Locator, identifies the location of a resource and the protocol used to access it.
Web Server: A web server is software, and often the computer running it, that receives web requests and returns resources or application responses.
HTTPS: HTTPS is HTTP carried over an encrypted TLS connection.
Sources and further reading
This entry is a concise, independently written definition based on established documentation. The linked references provide standards, product documentation or broader technical context.