Partial reconfiguration
Beginner
Changing the design in one part of an FPGA while the rest keeps running.
Novice
Loading a partial bitstream that rewrites only one region of the FPGA, while the rest of the design keeps working. AMD calls it Dynamic Function eXchange.
Expert
Rewriting the configuration frames of a reconfigurable region while the static logic keeps running. Frames are the smallest unit of configuration, so regions are made of whole frames.