Which software protect your computer from harmful files trojan horses and worms

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Harmful files, Trojan horses, and worms can be prevented if you have antivirus software on your computer. Often, you'll need to get this through a third party, as Windows Defender and another pre–installed antivirus can only do so much. There are many options on the market – it's best to take a while and shop around and compare options before making a decision. 

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I’d say platform as a service (paas) or application platform as a service (apaas) or platform base service is a category of cloud computing services that provides a platform allowing customers to develop, run, and manage applications without the complexity of building and maintaining the infrastructure typically associated with developing and launching an app.