Public clouds generally refer to software-as-a-service (SaaS) apps like those provided by Salesforce.com and infrastructure-as-a-service (IaaS) platforms like Amazon Web Services.

公开云通常是指软件即服务（SaaS）应用，像是Salesforce.com所提供的，还有基础设施即服务（IaaS），像亚马逊网络服务（AWS）。

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Public Service Media (PSM) is media which fulfils the same public purposes as public service broadcasting, but uses digital media and platforms, including the Internet, instead of broadcast television or radio.

UNESCO: Public Service Media