This video belongs to the series "Let's talk about geotechnics!". It's composed of "street interviews". We asked "What is geotechnics ?", and got a wide range of answers! This video is proposed by CFMS (French Society for Soil Mechanics and Geotechnical Engineering, member of ISSMGE), USG ("Union Syndicale de Géotechnique"), and Syntec Ingénierie. This version includes sub-titles in English language. Video prepared by Julie Clavier.