The Camera Serial Interface (CSI) is a specification of the Mobile Industry Processor Interface (MIPI) Alliance. It defines an interface between a camera and a host processor.
The latest active interface specifications are: CSI-2 v4.1 (April 2024), CSI-3 v1.1 (March 2014), and CCS v1.1.1 (April 2023).
The Camera Interface block or CAMIF is the hardware block that interfaces with different image sensor interfaces and provides a standard output that can be used for subsequent image processing.
A typical Camera Interface would support at least a parallel interface although these days many camera interfaces are beginning to support the Mobile Industry Processor Interface (MIPI) Camera Serial Interface (CSI) interface.
View the full Wikipedia page for Camera interface