Preface to the special issue dedicated to Saber Elaydi on the occasion of his 80th birthday.

This article is a preface to a special issue of the Journal of Difference Equations and Applications dedicated to Saber Elaydi on his 80th birthday. Elaydi is recognized for his significant contributions to the field of difference equations and discrete dynamical systems. He has had a successful academic career, serving as a professor and chair at Trinity University in Texas. Elaydi has also been a valuable teacher and mentor, inspiring students and attracting disciples from around the world. He has written influential books on difference equations and has been involved in organizing conferences and founding journals in the field. Elaydi's research interests cover a wide range of topics, including mathematical biology, neuroscience, and economics. He has made substantial contributions to these areas and has been recognized with prestigious awards. The article expresses appreciation for Elaydi's achievements and wishes him continued success in his mathematical and personal life. [Extracted from the article]