The feature that limits how often members can send messages in a channel is Slow Mode. When enabled, Discord requires users to wait for a set number of seconds before posting another message in that channel.
Slow Mode is a moderation and conversation-management tool. It is especially useful during fast-moving discussions, live events, question-and-answer sessions, or situations where a channel is being overwhelmed by repeated posts. The delay can apply to ordinary members while moderators and users with appropriate permissions may be exempt, depending on the channel’s permissions and Discord’s configuration.
Slow Mode is commonly confused with a server-wide rate limit or an anti-spam filter. A rate limit is a behind-the-scenes restriction used by software systems, while an anti-spam system detects or blocks suspicious behavior. Slow Mode is visible, deliberate, and channel-specific: users can still participate, but messages must be spaced apart. It also differs from Discord’s slow-mode-like controls in forums or threads, which may have their own moderation settings.