'Yu Jing Cha Ci' is a Chrome browser extension designed to enhance your understanding of foreign words and phrases by providing contextual translations. When a user highlights a word or phrase, the extension automatically captures the surrounding context and utilizes ChatGPT to generate accurate translations and usage examples. The integration with ChatGPT ensures that the translations are not just literal but also functional within the given context, making it easier for users to understand and use new words appropriately.