（1）中國互聯(lián)網(wǎng)絡(luò)信息中心（CNNIC）對于域名的解釋
域名類似于互聯(lián)網(wǎng)上的門牌號碼，是用于識別和定位互聯(lián)網(wǎng)上計算機的層次結(jié)構(gòu)式字符標(biāo)識，與該計算機的互聯(lián)網(wǎng)協(xié)議（IP）地址相對應(yīng)。但相對于IP地址而言，更便于使用者理解和記憶。域名屬于互聯(lián)網(wǎng)上的基礎(chǔ)服務(wù)，基于域名可以提供WWW、EMAIL、FTP等應(yīng)用服務(wù)。
（2）國際互聯(lián)網(wǎng)名稱和地址分配組織（The Internet Corporation for Assigned Names and Numbers，ICANN）對域名的定義
ICANN是域名的管理機構(gòu)，對于域名的定義應(yīng)該是最權(quán)威的，不過目前從ICANN網(wǎng)站上并沒有發(fā)現(xiàn)關(guān)于“domain name”這一定義，而是關(guān)于“Domain Name System”（域名系統(tǒng)）：
What is the Domain Name System?
The Domain Name System (DNS) helps users to find their way around the Internet. Every computer on the Internet has a unique address - just like a telephone number - which is a rather complicated string of numbers. It is called its "IP address" (IP stands for "Internet Protocol"). IP Addresses are hard to remember. The DNS makes using the Internet easier by allowing a familiar string of letters (the "domain name") to be used instead of the arcane IP address. So instead of typing 207.151.159.3, you can type www.internic.net. It is a "mnemonic" device that makes addresses easier to remember.
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