The education system encompasses early and preschool education for children aged from 6 months up to their departure to primary school. Taking into consideration that the year before the child enrolls in a primary school is mandatory in preschool education, it is necessary to prepare the child for that step. This B.A. thesis will be directed towards preschool education. (Ministry of Science, Education and Sport, 2014.) The purpose of this thesis is to distinguish the significance of the kindergarten teacher in all segments of the child's development while putting an emphasis on the development of the social dimensions put out by the socio-cultural theory of Lev Vygotsky. It will show both the traditional and the modern approach to working as a preschool educator and it will also show its influence in various developmental areas such as socio-emotional development, speech development, cognitive development and motor development. Furthermore, it will also explain the role of the educator in play after which there is a spatial and material environment in both indoor and outdoor space. The significance of the environment and factors which influence the child's development directly or indirectly is elaborated upon through the ecological systems theory of Urie Bronfenbrenner. Since the educator is the person to whom children become most attached to, it is expected that they will have a high-quality and appropriate approach towards children. This means that they will show respect, empathy and care to a child, all while assisting them to progress in every aspect of their development. Their competences and qualities will be developed through adequate education and continuous professional improvement and through gaining knowledge and skills which will contribute to their professional development as a good kindergarten educator and as a person who is, alongside the child's parents, an extremely important figure in a child's upbringing.