I will discuss recent developements in gravitational-wave physics. After reviewing the classical results from the Hulse-Taylor binary pulsar and the recent developements due to the double pulsar, I will discuss the present status of direct searches of GWs with interferometers. I will conclude examining what can we hope
to learn, both in general relativity and in cosmology, from the observations of the coalescence of compact binaries made of black holes or neutron stars.