DNS

• The Domain Name System (DNS) is the phonebook of the Internet. Humans access information online through domain names.
• • Web browsers interact through Internet Protocol (IP) addresses. 
• DNS translates domain names to IP addresses so browsers can load Internet resources.
• DNS servers eliminate the need for humans to memorize IP addresses such as 192.168.1.1 (in IPv4), or more complex newer alphanumeric IP addresses such as 2400:cb00:2048:1::c629:d7a2 (in IPv6).
• A Record:

  • Changing the A record of a domain will transfer the Website host.
  • Whoever owns the IP Address is responsible for running the website
• MX Record:

  Changing the MX record of a domain will transfer the host or the provider of the email service.
• Name Servers:

  Changing the Name servers of a domain transfers the hosting responsibility of the website and email services to a different provider
• DNS records (short for "Domain Name System records") are types of data that are stored in the DNS database and used to specify information about a domain, such as its IP address and the servers that handle its email.
• NS - Nameserver clarifies the zone’s authority. 
• A - Address specifies a host’s IPv4 address. 
• AAAA - Provides a host’s IPv6 address
• CAA - Certificate Authority Authorization specifies a domain’s possible CAs. 
• CNAME - Canonical Name defines an alias
• MX - Mail Exchange assigns email servers a domain.
• SRV - Service Locator provides information about other services.
• TXT - Text provides the option of entering additional texts (SPF, DMARC, DKIM)