Reliability engineering is a field of engineering that focuses on the reliability of a system, its components, and the environment in which it operates. It is concerned with understanding the behavior of a system and its components, predicting the likelihood of failure, and developing strategies to improve the reliability of the system. Reliability engineering involves the use of a variety of techniques and tools, such as fault tree analysis, failure mode and effects analysis, and reliability modeling. These techniques and tools help to identify potential failure points and their causes, as well as to develop strategies to improve the reliability of the system. Reliability engineering also includes the development of maintenance and testing procedures to ensure that the system remains reliable over time. Ultimately, the goal of reliability engineering is to ensure that the system is able to meet its performance requirements and to reduce the risk of failure.