The Virgo gravitational wave detector is an interferometer with 3 km l
ong arms in construction near Pisa in Italy. The accessible sources at
the design sensitivity and main noises are reviewed. Virgo has devote
d a significant effort to extend sensitivity to low frequency reaching
the strain level (h) over tilde = 10(-21) Hz(-1/2) at 10 Hz while at
200 Hz (h) over tilde = 3.10(-23) Hz(-1/2). Design choices and status
of construction are presented.