雲端主機主要是指可根據網絡流量自動擴大並同步化群集節點之間的狀態更改的彈性網絡伺服器集群網絡。雲端主機亦可指支援數百萬用戶同時使用的規模化運作數據中心。網絡託管公司從雲端數據中心獲得最新的創新，並在零售層面將之介紹給共享伺服器客戶，以獲得更好的網站性能。
大多數的價格介乎每月3至12美元之間零售雲端主機帳戶結合了網絡負載平衡、低密度硬件、高性能伺服器、SSD存儲、平台虛擬化、網站高級緩存結合、可擴展系統資源、堆棧快照以及對PHP 7、HHVM、HTTP/2、CDN等的支援。這些公司利用“大數據”和企業IT數據中心的進步推出平台即服務（PaaS）/軟件即服務（SaaS）/基礎設施即服務（IaaS）計劃。
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