A review is presented of a number of correlational effects in inner shell processes. Those examples are discussed, where correlations play a considerable or even a decisive role. The photoionization process with its intra‐ and intershell interaction, single and multiple vacancy formation is discussed. The role of correlational effects is described in the probability of creation, energy shift from the corresponding one‐electron value and decay width of single and double vacancy states. Near threshold phenomena with all different kinds of interelectron interaction in the final state are studied. The prominent role of correlations in the process of photon emission in electron‐atom scattering is also demonstrated. The perspectives of the development of this domain of physics are also outlined.