The Erasmus Student Network (ESN) is the largest student association in Europe, present in over 490 Higher Education Institutions. It was born on the 16th October 1989 and legally registered in 1990 for supporting and developing student exchange and mobility.
ESN Leeds is the section at Leeds University, and is one of 21 sections in ESN UK.
How to become a member? It is easy, just follow the steps right here: http://leeds.esnuk.org/become-member