Axions and Axion-like Particles

Abstract

I review the theoretical motivation for the axion and present an update of the experimental status of axion searches. I finally comment on some aspects of the physics of axion-like particles.

Comments: 16 pags. Invited talk at 30th International Meeting on Fundamental Physics, (January 2002, at Jaca, Huesca, Spain). To be published in the Proceedings