What is meant by support services? What do these services usually include in the business environment?

In a simple word Support services are those function of organization which does not  generate main business.  Support services provide internal support to the main business of organization. Generally HR, Finance, Logistics, Admin and IT are the support services and club together.  

Activity or function required for successful completion of a process, program, or project.

Support services are intended to support the productive staff of the operation. Take for instance in my last manager role. The productive employees were the service advisors and the technicians. Support staff included file room clerk, runners, porters, drivers and the cashier.

Troubleshouting problem customer encouter when they upload thier hosting( web pages and Db) files and check the web sever and DB sever requirement against the customer file.

support services is huge division and including, IT section, Media section, property department, housing, environment services, catering, and I'll chose my support depends on the services.

support services are what the organization offer there departments to create for there employee's a healthy  & comfortable environment  to increase there productivity 

like ( furniture  - lighting system - stationary - catering -  ...ETC)