  Low-x physics is reviewed, with particular emphasis on searches for
deviations from GLAP evolution of the parton densities. Although there are
several intriguing indications, both in HERA and Tevatron data, as yet there is
no unambiguous evidence for other than standard next-to-leading-order GLAP
evolution. The framework of dipole models and saturation of parton densities is
examined and confronted with the data. Although such models give a good
qualitative description of the data, so do other, more conventional,
explanations.
