Called every frame. This will be the same as GM:Tick on the server when there is no lag, but will only be called once every processed server frame during lag.
See GM:Tick for a hook that runs every tick on both the client and server.
On server, this hook WILL NOT run if the server is empty, unless you set the ConVarsv_hibernate_think to 1.
Example
hook.Add( "Think", "MyCoolThinkFunction", function()
-- Do something every frame/tickend )
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