The Term STP is used to Generically refer to the Spanning Tree Concept, but there are versions that have their own name and Acronym
Cisco switches running IOS 15.0 or later, run PVST+ by default
Switches must be explicitly configured for rapid spanning tree mode in order to run the rapid spanning tree protocol
There are 4 You Need to Know
STP
PVST+
RSTP
MSTP
MST
The Generic “STP” Concept
Current Most Common