Spintronics is a field of condensed matter physics that studies phenomena in which both spin and charge of an electron play an important role. In the past spintronics has focused largely on ferromagnetic materials, however, recently also antiferromagnetic materials has attracted interest. Antiferromagnets are materials which have a long range magnetic order such that the net magnetic moment is zero. They have some advantages over ferromagnets such as very fast magnetic dynamics and wide range of available materials. Using antiferromagnets is challenging because the antiferromagnetic order is hard to manipulate and detect, however, with the advent of spintronics a new possibilities emerge, such as electrical or optical detection and manipulation. Here we discuss a new method which allows for electrical manipulation of the antiferromagnetic order. The method is based on the so-called spin-orbit torque, which is known to exist in ferromagnets with broken inversion symmetry. We demonstrate that this method can also be used in antiferromagnets, however, the symmetry requirements are different. In particular a local, rather than a global, inversion symmetry breaking is necessary. We calculate the spin-orbit torque in several antiferromagnetic crystals and also discuss the experiments which have demonstrated switching of an antiferromagnetic order using this method.