Nonlinear Editing means not linear, that the recording medium is not tape and editing can be performed in a non-linear sequence, not necessarily the sequence of the program. It describes editing with quick access to source clips and recording space, usually using computer disks to store footage. This removes the spooling and pre-rolls needed for VTR operations so greatly increasing the speed of work. Yet greater speed and flexibility are possible with realtime random access to any frame (true random access).
See also: Linear (editing), On-line (editing), True random access