互聯網是一個利用互聯網協定（IP）並且透過封包交換傳輸數據的公共互連電腦網絡系統。萬維網經常被當成互聯網的同義詞，但是萬維網並不等同互聯網，萬維網只是互聯網所能提供的服務其中之一。除了萬維網之外，互聯網所提供的服務還包括電子郵件、檔案傳輸協定、Telnet、網絡聊天、通話技術、即時通訊、傳真和Usenet。
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