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Variables in Elixir are bound with =. Names use snake_case. Reassigning a name doesn't mutate — it just rebinds the name to a new value.

name = "Alice"
age = 30
active = true

Elixir's basic types:

• Integers (arbitrary precision)
• Floats (64-bit)
• Booleans (true, false)
• Atoms — like Ruby symbols: :ok, :error, :fast — interned, used as identifiers
• Strings (UTF-8 binaries): "hello"
• Tuples: {:ok, value} — small fixed collections
• Lists: [1, 2, 3] — linked list, head/tail style
• Maps: %{name: "Alice", age: 30} — key-value

Atoms deserve a moment: they're cheap, immutable identifiers. The convention {:ok, value} and {:error, reason} for return values is everywhere in Elixir code.