Today, necessity of a private company as an economic contributor is notable. Due to globalization and mechanical changes, they need experienced and active working power. The research considers the impact of Training and Development on employee performance for businesses at all levels. It is typically vital for administrations of firms to maintain their employees' knowledge and abilities. It becomes of utmost importance for private companies, to gather new information for competitively serving and then to communicate it to the staff using some sorted out and precise methodology. Assessing this, descriptive and quite empirical approach is chosen to conduct an investigation looking at the impact that T and D has on the performance level of workers. The sample size in this study was 150 respondents of different private companies in Bangladesh. Major findings show that the majority of employees agree with in the points by indicating that T & D had a positive impact on their job knowledge, work quality and quantity, functional skills, and motivation and loyalty are all strongly or moderately but constructively related to their performance. As a result, the study will show that T & D has a favorable effect on employees' performance in Bangladeshi private enterprises.