# The Domain Ecosystem

Canonical: https://learndns.org/learn/part-3-index/

> The business and operational side of domain names — how domains are named, registered, transferred, and managed across the registry-registrar system.

You understand how DNS works technically — the protocol, the records, the resolution chain. Now it's time to understand the *ecosystem* that sits on top of all that machinery.

DNS is a technical system. But domains are a business. And between the technical layer and the end user lies a surprisingly complex web of organizations, processes, policies, and protocols that govern how domain names are created, sold, transferred, and retired.

This is where DNS meets commerce.

## In This Part

We'll explore the complete domain ecosystem:

1. **Domain Name Anatomy** — SLDs, TLDs, subdomains, FQDNs, label rules, and internationalized domain names
2. **TLD Types** — gTLDs, ccTLDs, sTLDs, the new gTLD explosion, and special-use domains
3. **The Domain Lifecycle** — From registration to expiry, redemption, and deletion
4. **Registries, Registrars, and Resellers** — The three-tier system that makes domain registration work
5. **WHOIS and RDAP** — Domain ownership lookup, from the legacy protocol to its modern replacement
6. **Domain Transfers** — Auth codes, transfer locks, and the five-step process of moving domains
7. **DNS Hosting vs Domain Registration** — Why these are separate things and when it matters
8. **EPP Deep Dive** — The protocol registrars use to talk to registries behind the scenes

## What You'll Learn

By the end of Part 3, you'll be able to:

- **Parse any domain name** and identify its components, from the root to the leftmost label
- **Navigate the domain industry** — understand who the players are and how they interact
- **Register, transfer, and manage domains** with full understanding of what's happening behind the scenes
- **Query WHOIS and RDAP** for domain ownership data and understand what you're seeing
- **Read EPP status codes** and understand exactly what state a domain is in
- **Choose DNS providers** intelligently, separating registration from hosting concerns

## Prerequisites

This part assumes you've read [Part 2 (How DNS Works)](/learn/part-2-index/) or already understand DNS fundamentals — records, zones, resolution, and authoritative nameservers. The concepts here build on that technical foundation but focus on the operational and commercial layer.

Let's explore the ecosystem.