cefclient.dat is part of a product called known as Chromium Embedded Framework (CEF) Client Application and the developer is Unknown .
If you think that this file contains a virus or another malware, please download a virus scanner.
If cefclient.dat is using too much CPU or too much memory in your system, it is possible that your file has been infected with a virus. Installing an antivirus is recommended.
Not all processes can be uninstalled without the help of a 3rd party tool, especially malware. To see if it can be uninstalled, first go to Start > Control Panel > Add/Remove programs and select Chromium Embedded Framework (CEF) Client Application from the list to remove the process cefclient.dat from your computer.
If you have any problems with cefclient.dat, you may try using a registry cleaner or a speed-up software to check, analyze, and fix problems that are affecting the performance of your computer.
You may try contacting Unknown, the developer of cefclient.dat and ask for more information.