If the user doesn't approve the change, the action isn't performed and the application that requested the change is prevented from running. If the user approves the change, the action is performed with the highest available privilege. The prompt notifies the user that a change is about to occur, asking for their permission to proceed: When a user tries to perform an action that requires administrative privileges, UAC triggers a consent prompt. These applications are referred to as legacy apps. Other applications, like ones that aren't designed with security settings in mind, may require more permissions to run successfully. Most applications, including the ones included with the operating system, are designed to work properly this way. Any applications that are started using Windows Explorer (for example, by opening a shortcut) also run with the standard set of user permissions. For instance, Windows Explorer automatically inherits standard user level permissions. Processes launched using a standard user token may perform tasks using access rights granted to a standard user. UAC allows all users to sign in their devices using a standard user account. UAC is enabled by default, and you can configure it if you have administrative privileges. Unless you disable UAC, malicious software is prevented from disabling or interfering with UAC settings. 
UAC empowers users to make informed decisions about actions that may affect the stability and security of their device. UAC improves the security of Windows devices by limiting the access that malicious code has to execute with administrator privileges. When changes to the system require administrator-level permission, UAC notifies the user, giving the opportunity to approve or deny the change.
User Account Control (UAC) is a Windows security feature designed to protect the operating system from unauthorized changes.
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