The diffractive program of the CDF Collaboration at the Fermilab
Tevatron p anti-p Collider is reviewed with emphasis on recent results from
Run-II and future prospects.

Diffractive p anti-p interactions are characterized by the presence of at
least one large rapi+dity gap, defined as a region of pseudorapi+dity [1]
devoid of particles.  A diffractive rapi+dity gap, which may be forward
(adjacent to a leading nucleon) or central, is presumed to be formed by the
exchange of a Pomeron [2], which in QCD is a color singlet quark/gluon
object with vacuum quantum numbers.  Diffraction in which there is a high
momentum-transfer partonic scattering in the event in addition to the
rapi+dity gap is referred to an hard diffraction.  In this paper, we briefly
review the results on diffraction obtained by the Collider Detector at
Fermilab (CDF) in Run-I (1992-1995), present an update of results from
Run-II, which is in progress, and discuss future prospects.