A Zero Client is an ultra-secure, stateless endpoint device that receives encrypted pixels, rather than actual data.  Because zero clients effectively have no (zero) OS, session memory, or storage, they are the ultimate secure endpoint. Deter viruses and malware and feel protected if the device is lost or stolen.  Moreover, IT can lock the device so that end users cannot copy or download data. 

Using a zero client with an integrated CAC (common access card) card reader allows multiple employees to share the same device but with different levels of access to the server, cloud, or data center.  Because the CAC reader is integrated, you can attain security level access with fewer cords, peripherals, and with a less cluttered desktop.