What is difference between "a" and 'a'?

@Dito wrote:

What does function sizeof() do?

sizeof("a")
1

julia> length('a')
1

julia> sizeof('a')
4

julia> sizeof("∀")
3

julia> sizeof('∀')
4

julia> sizeof("🍎")
4

And if sizeof() gives us the size of used memory in bytes why there is difference between “a” and ‘a’ ?

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