The organization is very important, for individual as well as for the whole society. Employees are one of the key business success factors and as such represent the most important resource of each organization. In order to efficiently and effectively perform the tasks they are facing, they need to be motivated and satisfied with the job they are doing. Human Resource Management is a complex and demanding process, so the tasks carried out by the human resources manager are not easy. He must be a successful leader, listen to the employee's pulse, notice changes in their behavior and promptly respond to increase their motivation for work and prevent any negative consequences that job dissatisfaction undoubtedly entails, as they reflect not only on the employee, but also on the organization itself, as well as the achievement of its goals. It is therefore important to know which factors motivate employees because only a satisfied employee is a guarantee of a successful organization. The goal of this paper is to show the importance of motivation, the theory of motivation, and the importance of employee motivation for successful functioning of the organization and an explanation of the factors that influence employee’s motivation. It is confirmed that employees are the most important factors of a successful organization, and that it is this motivation to work that is of key importance for achieving organizational goals. It should be taken into account that not all employees need it, so it is necessary to apply an individual approach.