Why do some people do this

Help and Feedback Scripting Support
1

instead of doing

print("hi")

they do

do
print("hi")
end
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2

It controls the scope, so if you define a variable inside a do - end block, it will nil outside the block.

local x = "foo"

do
    local y = "bar"
    print(x) -- foo
    print(y) -- bar
end

print(x) -- foo
print(y) -- nil
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