  We report on recent progress in understanding confinement of colour in $QCD$
as dual superconductivity of the vacuum. A gauge invariant version of the
creation operator of monopoles is constructed whose vacuum expectation value is
the order parameter. This order parameter is gauge-invariant from scratch, has
no infrared divergences, is finite in the confined phase and vanishes in the
deconfined phase. A natural explanation also emerges of why the electric field
lines in the flux tubes keep no memory of the colour orientation of the
condensing monopoles. A further by-product is that the order parameter can be
traded with the two-point vacuum parallel correlator of the chromo-electric
field.
