system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What's the difference between a cog and a gear?
gpt
In the strict sense, a "cog" is a tooth on a wheel. A cogwheel is any wheel with teeth. A gear is a cogwheel used to mesh with another cogwheel. And a sprocket is a cogwheel that links to another cogwheel by means of a chain.