This lecture explores the phenomenon of many-body localisation (MBL) under the microscope, focusing on the quantum walk, interactions, disorder, and Anderson localisation. The instructor discusses the signatures of MBL, breakdown of thermalization, and the emergence of non-local entanglement. The lecture delves into the quantum information and condensed matter aspects of MBL, highlighting the memory of initial states and the breakdown of thermalization. The presentation concludes with a detailed analysis of the quantum critical regime, including the hierarchy of quantum correlations and the transition to MBL. The lecture also covers the absence of transport, the logarithmic growth of entanglement, and the experimental and theoretical outlook on MBL.