Since the Solar and Heliospheric Observatory (SOHO) mission <br />
has observed coronal mass ejections (CMEs) for more than <br />
a solar cycle, we have an extensive data set to fully understand <br />
the CME phenomenon. <br />
This talk summarizes the major achievements of SOHO including: <br />
(i) CME-CME interaction, <br />
(ii) CME-Solar Wind Interaction and CME/shock transit time, <br />
(iii) CME-driven shocks and type II radio bursts, <br />
(iv) CMEs and solar energetic particles, <br />
(v) CME-flare relationship, <br />
(vi) CMEs and coronal holes, <br />
and CMEs and prominence eruptions.