GPT for Sheets provides various AI functions to enhance productivity and efficiency in Google Sheets, Docs, and Excel. It offers features such as data preparation, analysis, and rewriting of content. With GPT for Sheets, users can clean lists, generate tags, create ad copy and product descriptions, generate outlines for blog posts, emails, and speeches, as well as summarize meeting notes. It also has the ability to rephrase content in perfect English. This AI tool is designed to streamline tasks and improve the quality of work in spreadsheet and document management.