What is a DNS server?
DNS stands for Domain Name System. A DNS server resolves a name
to an IP address, as stated in an earlier answer, but it can also
point to multiple IP addresses for load balancing, or for backup
servers if one or more is offline or not accepting connections.
Individual organizations may have their own DNS servers for
their local Intranet.
Some sites have their own DNS server to switch between
subdomains within them. For example, a site such as Blogspot can
have subdomains come and go quite frequently. Rather than force
every DNS server to update their own databases whenever someone
creates a new blog, Blogspot could maintain their own DNS server to
resolve names within the blogspot.com domain, e.g., to distinguish
between myblog.blogspot.com and yourblog.blogspot.com ... their DNS
server would be queried once blogspot.com is resolved, and it would
be responsible for resolving myblog vs. yourblog.
DNS stands for Domain Name System, the system by which the names
of "http://www.shareasale.com/r.cfm?b=569377&u=617808&m=48436&urllink=&afftrack=" target="_blank">websites
target="_blank">websitesand Internet domains are managed. A
DNS server is any computer registered to join that system.