What is a multitape TM?
A multi-tape Turing machine having of a finite control with k-tape heads and k-tapes each tape is infinite in both directions. On a one move depending on the state of finite control and symbol scanned by each of tape heads ,the machine can alter state print a new symbol on every cells scanned by tape head, move each of its tape head independently one cell to the left or right or remain stationary.