Entanglement Between Noncomplementary Parts of Many Body Systems This thesis investigates the structure and behaviour of entanglement the purely quantum mechanical part of correlations in many body systems employing both numerical and analytical techniques at the interface of condensed matter theory and quantum information theory. Entanglement can be seen as a precious resource which for example enables the noiseless and instant transmission of quantum information provided the communicating parties share a sufficient amount of it. Furthermore measures of entanglement of a quantum mechanical state are perceived as useful probes of collective properties of many body systems. For instance certain measures are capable of detecting and classifying ground state phases and particularly transition (or critical) points separating such phases. Chapters 2 and 3 focus on entanglement in many body systems and its use as a potential resource for communication protocols. They address the questions of how a substantial amount of entanglement can be established between distant subsystems and how efficiently this entanglement could be harvested by way of measurements. The subsequent chapters 4 and 5 are devoted to universality of entanglement between large collections of particles undergoing a quantum phase transition where despite the enormous complexity of these systems collective properties including entanglement no longer depend crucially on the microscopic details.