--- title: Domain Knowledge 101 description: Learn the basics of domains and domain reselling. Discover what domains are, why they matter, and the key terms every domain reseller should know. --- [Skip to content](https://help.opusdns.com/domain-knowledge-101#main-content) - [English](https://help.opusdns.com/domain-knowledge-101) - [Deutsch](https://help.opusdns.com/de/das-domain-101) English Show submenu for translations [![opusdns.com](https://help.opusdns.com/hs-fs/hubfs/v2-Status%20Center.png?width=180&height=51&name=v2-Status%20Center.png)](https://help.opusdns.com/?hsLang=en) Open main navigation Close main navigation - - [English](https://help.opusdns.com/domain-knowledge-101) - [Deutsch](https://help.opusdns.com/de/das-domain-101) English Show submenu for translations - [Submit Ticket](https://support.opusdns.com/) [Submit Ticket](https://support.opusdns.com/?hsLang=en) How can we help? - There are no suggestions because the search field is empty. 1. [OpusDNS Knowledgebase](https://help.opusdns.com/?hsLang=en) 2. [New to the Domain Industry?](https://help.opusdns.com/new-to-the-domain-industry?hsLang=en) May 28, 2026 # Domain Knowledge 101 If you’re new to the world of domains and domain reselling, it can seem overwhelming at first. However, understanding the basic concepts can help you get started quickly. In this article, we will explain the key aspects of domains so that you can gain the knowledge necessary for success in the domain reselling industry. ### What is a Domain? A domain is a unique address on the internet that points to a specific website or service. It consists of two parts: the name (e.g., "example") and the top-level domain (TLD) such as ".com" or ".de". Together, they form the complete URL (Uniform Resource Locator) of a website. ### Why Are Domains Important? Domains are crucial for being visible on the internet. They allow users to find and access websites. For businesses, a well-chosen domain is an important part of their online presence and brand identity. ### The Role of Domain Resellers Domain resellers play a key role in the domain ecosystem. They purchase domains in bulk from domain registrars and sell them to end customers. Resellers often offer additional services like web hosting, SSL certificates, and domain management. ### Key Terms to Know 1. **ICANN:** The Internet Corporation for Assigned Names and Numbers (ICANN) is the organization responsible for managing domain names and IP addresses globally. 2. **DNS (Domain Name System):** DNS translates user-friendly domain names into IP addresses that computers can understand. 3. **WHOIS:** WHOIS is a protocol that provides information about the owners of domain names. ### Conclusion Domain knowledge is essential to succeed as a domain reseller. 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