Halos represent a new type of nuclear structure that has been found in some light nuclei at the limits of nuclear existence. Review of different reactions with two-neutron halo nuclei is given and their use for extracting information about the structure of exotic nuclei is presented. A microscopic four-body approach to breakup reactions of two-neutron halo nuclei which takes into account their characteristic features is described. The model is based on the distorted wave method and can be used to analyse the low-energy continuum excitations near the breakup threshold - the region which is the most sensitive to specific properties of the halo structure. The approach allows one to calculate all observables of the kinematically complete experiments in the nucleus-nucleus collisions at intermediate energies, when one-step processes dominate, and establishes a base for the continuum spectroscopy via the consistent analysis of different correlations.

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