Electro-optic devices are instruments that utilize the interaction between electric fields and light to control and manipulate optical signals. These devices often employ materials that change their optical properties in response to an applied electric field, allowing for applications such as modulation, switching, and beam steering. Common examples include electro-optic modulators and liquid crystal displays. These devices are essential in various fields, including telecommunications, where they help transmit data over long distances by modulating light signals. They are also used in laser technology and optical sensing, contributing to advancements in imaging systems and information processing.