B Physics, CP Violation and the CKM Fit
For half a decade, the asymmetric-energy B Factory experiments BABAR and Belle have been greatly improving our knowledge of CP violation in the quark sector of the electroweak interaction. These experiments are part of a vast effort that is being undertaken to study the enigma of CP violation, and related physics questions, within and possibly beyond the Standard Model of particle physics. The present results confirm our understanding of CP violation as being due to a single observable phase in the CKM quark-mixing matrix. However, there also exist signs that we may be witnessing something unknown that goes beyond that picture. The colloquium reviews the current status of the CKM matrix with emphasis on the most recent B physics results on CP violation.