I will present entanglement as a resource theory where the free operations are local operations and classical communication. I will not closely follow any particular reference, but all the topics I will present can be found in: - M. A. Nielsen, I. L. Chuang, Quantum Computation and Quantum Information, Cambridge University Press, 2010, sec. 12.5; - I. Bengtsson, K. Życzkowski, Geometry of Quantum States: An Introduction to Quantum Entanglement, 2nd edition, Cambridge University Press, 2017, chpts. 16-17; - E. Chitambar, G. Gour, Quantum resource theories, Rev. Mod. Phys. 91 (2019), 025001.