The school is devoted to braids and their different applications and aspects. This fourth edition of Winter Braids occurs in the framework of the ANR projects Interlow and VasKho and is organized by the Université de Bourgogne and the GDR Tresses. This year the school is also supported by the ESF program ITGP and by the French CNRS as école thématique. Besides the main lectures, there will be three half-days devoted to student presentations (not necessarily focused on braids or their generalisations). All talks will be held in English.