I am confused about the difference between function calls via . and via :

local x = {
    foo = function(a, b) return a end,
    bar = function(a,b) return b end
}

return x.foo(3, 4) -- 3
return x.bar(3, 4) -- 4
return x:foo(3, 4) -- table: 0x10a120
return x:bar(3, 4) -- 3

What is the : doing?

function lua
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