can someone explain the concept of "strings (or whatever) being immutable"

[Deb Wyatt]

a_string = "This is a string"

a_string is pointing to the above string

now I change the value of a_string

a_string = "This string is different"

I understand that now a_string is pointing to a different string than it was before, in a different location.

my question is what happens to the original string??  Is it still in memory somewhere, nameless?

Thanks in advance,

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