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Internet

Internet est le réseau informatique mondial accessible au public. C'est un réseau de réseaux, à commutation de paquets, sans centre névralgique, composé de millions de réseaux aussi bien publics que privés, universitaires, commerciaux et gouvernementaux, eux-mêmes regroupés en réseaux autonomes (il y en avait 47 000 en 2014). L'information est transmise par Internet grâce à un ensemble standardisé de protocoles de transfert de données, qui permet l'élaboration d'applications et de services variés comme le courrier électronique, la messagerie instantanée, le pair-à-pair et le World Wide Web.
L'internet ayant été popularisé par l'apparition du World Wide Web (WWW), les deux sont parfois confondus par le public non averti. Le World Wide Web n'est pourtant que l'une des applications d'internet.
L'accès à internet peut être obtenu grâce à un fournisseur d'accès via divers moyens de communication électronique : soit filaire (réseau téléphonique commuté(bas débit), ADSLfibre optique jusqu'au domicile), soit sans fil (WiMAXpar satellite3G+4G). Un utilisateur d'internet est désigné par le néologisme « internaute ».

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