What's different from Remote Event and Unreliable remote event?

Hi, I was wondering what the difference between Remote events and Unreliable remote events on Roblox.

What would be the use case for unreliable remote events?

First i would recommend moving this to Scripting Support category to not get yelled at by everyone

Pretty much remote event makes sure that the data you send on it gets received by either the client or server and it retries if it failed to send data (this is the event you should use most of the time)
Unreliable remote event just sends stuff without caring whether or not the receiver actually gets the info which can reduce network usage if you send non important info (Particles, constant visual CFrame changes and stuff like that) so if you for example want to send info every frame you should use unreliable remote instead
Remote Event documentation: RemoteEvent | Documentation - Roblox Creator Hub
Unreliable Remote Event documentation: UnreliableRemoteEvent | Documentation - Roblox Creator Hub

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