This research was carried out with qualitative research and document analysis techniques. This study it is aimed to examine the development of distance education and teacher training practices and their practices in various countries and Turkey. The way to improve the organization is to develop human resources. The understanding of human resources of our age has also grasped the value of human power for the organization and has sought new approaches to develop this resource. Distance education is also considered as an approach where technology is used intensively to train human resources before and during service. Particularly, developments in internet and intranet technology also enable interaction between teacher and learner, learner and learner with virtual classroom applications and the use of whiteboards. Distance education, which found intense application opportunities during the pandemic (Covid 19) affecting the whole world, has brought a new perspective to education processes. In this study, the concept of distance education is discussed in the context of its use in in-service training of teachers.