[erlang-questions] What's the difference between tuple and list ?

[raocheng]

The Pragmatic Programming Erlang says:
1) Suppose you want to group a fixed number of items into a single
entity.For this you'd use a tuple.
2) We use lists to store variable numbers of things.

However, we know that variables in Erlang are in essence invariable. So what
is the difference between tuple and list ?

Thanks in advance.
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