Chunks in motor learning are identified by pauses between successive actions...
Chunking in cognitive psychology and mnemonic, refers to a strategy for more efficient use of short-term memory by recording and retrieving information in small segments.
It is like eating an elephant, we can only eat one small piece at a time, yet, given time, we can finish the whole elephant!
For more academic explanation on Chuncking, read the following!
Source of information:
"Chunking (psychology)" from Wikipedia