Resumen: In these notes I try to introduce the reader to the topic of axions: their theoretical motivation and expected phenomenology, their role in astrophysics and as a dark matter candidate, and the experimental techniques to detect them. Special emphasis is made in this last point, for which a relatively updated review of worldwide efforts and future prospects is made. The material is intended as an introduction to the topic, and it was prepared as lecture notes for Les Houches summer school 2021. Abundant references are included to direct the reader to deeper insight on the different aspects of axion physics. Copyright I. G. Irastorza. This work is licensed under the Creative Commons Attribution 4.0 International License. Idioma: Inglés DOI: 10.21468/SciPostPhysLectNotes.45 Año: 2022 Publicado en: SciPost Physics Lecture Notes 45 (2022), - [54 pp] ISSN: 2590-1990 Factor impacto CITESCORE: 9.1 - Physics and Astronomy (Q1)