The Standard Model (SM) explanation of CP violation is that it is due to a complex phase in the CKM matrix. This explanation was tested by the measurements of CP violation in B decays by the B-factories BaBar and Belle in the 2000s. In the end, the data was all consistent with the SM explanation ... with one exception. In 2003, it was noted that the measurements of observables in B -> Pi K decays were not entirely self-consistent and could be hinting at the presence of new physics. This is the B -> Pi K puzzle, and it is still present today. In this talk, I will review the subject of CP violation in B decays and discuss the present status of the B->Pi K puzzle.