There are hundreds of different roles & responsibilities in the IT Security career field alone. Here are some of the common types that I have seen:

Information System Security Manager – coordinate with the system owner and the information system security officer to ensure security is on the systems.
Information System Security Officer – coordinate with management and system administrators to implement system security controls. Ensures security controls are tracked and documented.
System Administrator – applies technical functionality and security on information systems.
Architect – assists in the design of enterprise information systems.
Security Analyst – review the logs of information systems to determine if there are any malicious activities happening.
Auditors – review the information systems to make sure the security controls are applied, documented and continuously monitored.