Abstract: At the first part of this talk I will review the notion of quantum entanglement in QFTs and describe the holographic approach to entanglement entropy via some examples. I will also try to address a conceptual question: "Is holographic entanglement entropy just a holographic tool or it has something more?" In the second part I will review recent arguments about the structure of entanglement entropy in the coulomb branch of N=4 SU(N) SYM theory.