The article is dedicated to the generalization of the most relevant scientific approaches to the study of the concept of loneliness, the subjective feeling of loneliness, the disclosure of the meaning and influence of the experience of loneliness in the development of personality. The levels of the subjective feeling of loneliness are empirically identified and described. The article highlights both the scientific and applied significance of research of the subjective feeling of loneliness of students during distance learning. Further prospects for research on this issue are indicated. Loneliness is a complicated socio-psychological phenomenon. Being a personal experience, it is difficult to describe, since its manifestations are always subjective. The ambivalence of loneliness lies in its ambiguous impact on a person - it is often perceived by people as a difficult and painful experience, but it cannot be denied that for personality development it is necessary to be alone from time to time. In the course of the study, an analysis of the phenomenon of loneliness as a socio-psychological phenomenon was carried out. The understanding of this phenomenon from the point of view of various researchers was considered, a number of definitions of the concept of loneliness were given. The analysis of the differences between such concepts as loneliness, isolation and seclusion was carried out and the classifications of types of loneliness were given. A theoretical analysis of such a concept as achievement motivation was also conducted, and the concept of affiliation motivation was briefly analyzed. In the world, the problem of loneliness of students during distance learning is particularly relevant. The development of technology has allowed a person to be in constant contact with a huge amount of information, to contact other people via Internet. But such limitless possibilities have a negative side. Dependence on information, characteristic of a modern person, distances it, plunging into its continuous consumption, depriving time of solitude, contact with one's feelings and thoughts.