Pharming involves redirecting users to a fraudulent Web site even when the user has typed in the correct address in the Web browser. pretending to be a legitimate business's representative in order to garner information about a security system. setting up fake Web sites to ask users for confidential information. using e-mails for threats or harassment.

Pharming involves:

redirecting users to a fraudulent website even when the user has typed in the correct address in the web browser.          

Explanation:

When a hacker steals your confidential and private information by installing a malicious code on your computer which misdirects you to fake and fraudulent websites, this is called pharming.Hacker installs virus on your computer which manipulates the host files on your computer.The hacker uses DNS cache poisoning to attack DNS services on your computer which makes many users to enter fraudulent site, unknowingly, as they type the URL of the real website.These fraudulent website developed by hacker can install virus on your computer and steal confidential information from your computer.Pharming is done by hackers in order to steal sensitive data from a person's computer.

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.