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We've historically been somewhat inconsistent in how we refer to the type of object defined by "variable" blocks in configuration. Parts of our documentation refer to them as "input variables" or just "variables", while our implementation refers to them as "user variables". Since Terraform Registry is now also referring to these as "Inputs", here we standardize on "Input Variable" as the fully-qualified name for this concept, with "variable" being a shorthand for this where context is obvious. Outside of this context, anything that can be referred to in an interpolation expression is generically known as a "variable", with Input Variables being just one kind, specified by the "var." prefix. While this terminology shift is not critical yet, it will become more important as we start to document the new version of the configuration language so we can use the generic meaning of "variable" there.