A reliability function is a mathematical tool used to describe the likelihood that a system or component will perform its intended function without failure over a specified period. It is often represented as a function of time and helps engineers and researchers assess the durability and performance of products, such as machinery or electronic devices. In reliability engineering, the reliability function is crucial for predicting failure rates and planning maintenance schedules. It is commonly used in various fields, including manufacturing, aerospace, and automotive industries, to ensure safety and efficiency in operations.