What does CGI stand for? Usually the letters mean computer-generated imagery, meaning pictures and motion made with software rather than filmed with a camera. Dragons, exploding planets, crowds of thousands and even whole cartoon worlds on screen are often CGI.
Web developers know a second meaning. In older website setups, CGI is the Common Gateway Interface, a standard way for a web server to run a small program and send its output back to a browser. The two meanings live in very different worlds, so the topic of the conversation usually settles which one you are hearing about.
Quick facts
Stands for (film, games)
Computer-generated imageryStands for (web)
Common Gateway InterfaceType
Initialism, said C G IUsed in
Movies, TV, video games, ads, older web serversRelated terms
VFX, 3D animation, motion capture, renderingNot to be confused with
CG, a shorter form for computer graphics
What does CGI stand for on screen?
Each letter carries part of the idea:
- C, Computer: the tool that does the work.
- G, Generated: made, built or calculated rather than recorded.
- I, Imagery: the pictures, still or moving.
Artists build 3D models on a computer, give them surfaces, light and movement, then let the software render each frame into a finished image. The result can be blended with live action footage or used to make a fully animated film. Commercials use it to show a product spinning in midair, and architects use it to show a building before it exists.
In a movie review: "The battle scenes rely heavily on CGI." The writer means many of the soldiers, ships and explosions were created digitally, not built on a set or filmed for real.
How CGI is used on screen
| Use | What it means | Example |
|---|---|---|
| Full animation | Every frame is made on a computer | An animated family film about talking toys |
| Visual effects | Digital elements added to filmed scenes | A monster walking down a real street |
| Set extension | A small real set made to look huge | A stadium crowd filled in digitally |
| Digital doubles | A computer copy of an actor for risky shots | A fall from a cliff |
| Product shots | A perfect, clean version of an item | A car in a TV commercial |
CGI often works together with practical effects, such as models, makeup and stunts. Many viewers notice CGI only when it looks fake, so some of the best work goes unnoticed. Running all of that rendering takes heavy computing, which is why studios lean on strong GPU hardware.
CGI on web servers: Common Gateway Interface
In web development, CGI means something else entirely. It is a standard that lets a web server hand a request to a separate program, often a script, and pass that program's output back to the visitor as a web page. Before modern frameworks, this was a common way to handle forms, search boxes and guest books.
You may still see a folder called cgi-bin on some servers, which is where those scripts were kept. Today most sites use newer methods, but the term lives on in older systems and hosting control panels. This meaning sits alongside other web basics like HTTP and HTML in our tech acronyms section.
Pronouncing and spelling CGI
You voice every letter separately, "C G I," which makes it an initialism. Capitals, no periods. It usually works as a noun, "the CGI was impressive," or as a describing word, "a CGI character." Since the first sound is "see," use a before it: "a CGI dragon."
- "The whole city in that scene is CGI."
- "She works as a CGI artist on commercials."
- "The old contact form ran on a CGI script."
- "They used real cars for the chase and CGI for the crash."
CGI, VFX, CG and 3D: what is the difference?
- CGI is any image made with a computer.
- VFX, visual effects, is the wider craft of changing or adding to filmed footage. It can include CGI, but also digital cleanup and compositing.
- CG is a shorter form of computer graphics and is often used the same way as CGI in studios.
- 3D animation is one kind of CGI, made from 3D models. Flat digital animation can also be computer made.
- CAD, computer-aided design, uses similar tools for engineering drawings, not for entertainment.
Questions people ask
What does CGI stand for in movies?
In movies it stands for computer-generated imagery. It covers digital creatures, scenery, crowds and effects made with software.
What is CGI stand for in web hosting?
On web servers it means Common Gateway Interface. It is an older standard that lets a server run a script and send the result back as a page.
Is CGI the same as animation?
Not exactly. Fully animated films can be CGI, but CGI also means digital effects mixed into live action. Some animation is drawn by hand and is not CGI at all.
How do you pronounce CGI?
Say C, then G, then I. No one blends the letters into a word.
Should CGI be called an acronym?
Strictly, no. Its letters are each sounded out, which makes it an initialism. In everyday talk, though, plenty of folks label it an acronym.