The full form of CGI can refer to different things depending on the context. Here are the most common meanings:
Common Gateway Interface: In the context of web development, CGI is a standard for interfacing external applications with web servers, allowing for dynamic content generation.
Computer-Generated Imagery: In the context of film, video games, and visual effects, CGI refers to the creation of still or animated visual content using computer software.
If you have a specific context in mind, please let me know!