In networked systems, a rate limiter acts like a traffic controller, managing how often a user or service can make requests. In the world of HTTP APIs, it sets boundaries on how many requests are allowed within a given time frame. Once that limit is reached, any additional requests are automatically blocked. Think of it like setting fair-use rules: a user might only be able to post twice per second, create up to ten accounts in a day from the same IP address, or claim rewards no more than five times in a week from a single device.

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