When the Domain Name System was devised in the 1980s, the domain name space was divided into two main groups of domains.[7] The country code top-level domains (ccTLD) were primarily based on the two-character territory codes of ISO-3166 country abbreviations. In addition, a group of seven generic top-level domains (gTLD) was implemented which represented a set of categories of names and multi-organizations.[8] These were the domains gov, edu, com, mil, org, net, and int.
Data protection is another key email security concern. Inboxes often contain GBs of business-critical and personal data, so not just hackers but also legitimate marketing companies can make big money off mining email data—and this sometimes includes the very company that is providing the email service to you. Fortunately, most companies, including your hosting provider, are pretty good about keeping out of private data, but it's important to be aware of when these policies have failed. Security breaches are commonplace and it's important to know how your data is being managed. To protect yourself, be sure to inquire about data safety capabilities on the provider's side, especially around encryption and malware scanning. But be sure to implement additional measures on your side, as well, including encryption for those using local email clients as well as deploying personal virtual private networks (VPNs) to folks accessing their email from multiple locations.
The Choice Plus plan offers the same email functionality as the plus plan along with access to SpamExperts but also includes domain privacy. The plan has an introductory cost of $5.95 per month — matching that of the Plus plan — and a regular price of $14.99 per month. Bluehost gives users secure socket layer (SSL) security for transactions on your website, but some third-party plug-ins can affect the security of your data.
Critics often claim abuse of administrative power over domain names. Particularly noteworthy was the VeriSign Site Finder system which redirected all unregistered .com and .net domains to a VeriSign webpage. For example, at a public meeting with VeriSign to air technical concerns about SiteFinder,[25] numerous people, active in the IETF and other technical bodies, explained how they were surprised by VeriSign's changing the fundamental behavior of a major component of Internet infrastructure, not having obtained the customary consensus. SiteFinder, at first, assumed every Internet query was for a website, and it monetized queries for incorrect domain names, taking the user to VeriSign's search site. Unfortunately, other applications, such as many implementations of email, treat a lack of response to a domain name query as an indication that the domain does not exist, and that the message can be treated as undeliverable. The original VeriSign implementation broke this assumption for mail, because it would always resolve an erroneous domain name to that of SiteFinder. While VeriSign later changed SiteFinder's behaviour with regard to email, there was still widespread protest about VeriSign's action being more in its financial interest than in the interest of the Internet infrastructure component for which VeriSign was the steward.

Email isn't going away any time soon. Despite a rise in adoption of collaboration-based communication platforms such as Microsoft Teams or Slack, 86 percent of professionals prefer to use email for business purposes. How companies host, store, and distribute their email—that's the area that has undergone a massive transformation. Businesses are veering away from costly onsite email servers running products such as Microsoft Small Business Server and looking instead to the cloud with hosted email solutions. Businesses of all sizes have realized the wisdom of going with a scalable and secure hosted Software-as-a-Service (SaaS) solution with guaranteed uptime that breaks down pricing into flexible, per-user charges.

Next are third-level domains, which are written immediately to the left of a second-level domain. There can be fourth- and fifth-level domains, and so on, with virtually no limitation. An example of an operational domain name with four levels of domain labels is sos.state.oh.us. Each label is separated by a full stop (dot). 'sos' is said to be a sub-domain of 'state.oh.us', and 'state' a sub-domain of 'oh.us', etc. In general, subdomains are domains subordinate to their parent domain. An example of very deep levels of subdomain ordering are the IPv6 reverse resolution DNS zones, e.g.,, which is the reverse DNS resolution domain name for the IP address of a loopback interface, or the localhost name.

The right to use a domain name is delegated by domain name registrars, which are accredited by the Internet Corporation for Assigned Names and Numbers (ICANN), the organization charged with overseeing the name and number systems of the Internet. In addition to ICANN, each top-level domain (TLD) is maintained and serviced technically by an administrative organization operating a registry. A registry is responsible for maintaining the database of names registered within the TLD it administers. The registry receives registration information from each domain name registrar authorized to assign names in the corresponding TLD and publishes the information using a special service, the WHOIS protocol.

The practice of using a simple memorable abstraction of a host's numerical address on a computer network dates back to the ARPANET era, before the advent of today's commercial Internet. In the early network, each computer on the network retrieved the hosts file (host.txt) from a computer at SRI (now SRI International),[4][5] which mapped computer hostnames to numerical addresses. The rapid growth of the network made it impossible to maintain a centrally organized hostname registry and in 1983 the Domain Name System was introduced on the ARPANET and published by the Internet Engineering Task Force as RFC 882 and RFC 883.
There are hosting providers that offer services ideal for a wide range of websites like ecommerce and personal sites that are packed with all the resources and features needed to build your own site online all with in one account, they provide domain names, drag and drop site builders, templates and themes and a large variety of plugins and components to help making your website a reality.