What is end user support?

It is supporting customers and computer users within an organization to ensure that all computers, software and peripherals are functioning properly.

Simple Customer Support  is end user support  basically  Technical Support either for software,hardware,network troubleshooting and solving the issue

End user support is a common word and we can divide it into hardware end user support and software end user support ...
mainly we work the both but it is common for any problem the user ( non-computer Engineer ) faces during his work include software .
hardware and networking issue

Giving first hand support to all employes in an organisation making sure that everything is running properly