What exactly does "setmetatable" do?

ive seen this function “SetMetaTable” used a lot in tutorials, free models , ect.

but what exactly is it used for? i have no idea and i need some help please.

Metatables are used to tweak what happens when you interact with a table (ex. stuff['Item1']). You can assign custom functions to “metamethods” such as index, newindex. Setmetatable simply assigns a metatable to given table.

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