Data loggers are electronic devices used to record environmental data over time. They can measure various parameters such as temperature, humidity, light, and pressure. Data loggers are commonly used in industries like agriculture, transportation, and research to monitor conditions and ensure compliance with safety standards. These devices typically consist of sensors, a data storage unit, and a power source. Data loggers can be standalone units or connected to a computer for real-time monitoring. They help in collecting accurate data, which can be analyzed later to make informed decisions or improve processes in fields like environmental science and quality control.