In Terraform, which data type can be used to define a list of values?

In Terraform, the list data type is specifically designed to hold an ordered sequence of values. It allows users to define collections of items that can be indexed and accessed via their position within the list. This is particularly useful when you need to manage a series of related values, such as a list of server IP addresses, names, or any other similar data that requires ordering.

When defining a list in Terraform, it is represented using square brackets, for example, ["value1", "value2", "value3"]. This syntax clearly indicates that the collection is a list, and it can contain elements of any data type, including strings, numbers, and even other complex types.

The other options provided do not represent lists. For instance, a string is a single sequence of characters, a map is a collection of key-value pairs, and a tuple is an ordered collection but is typically used for a fixed number of elements of potentially different types. None of them serve the same purpose as a list, which is focused on providing a flexible, ordered collection of similar items. Thus, the choice of the list data type is the correct answer when defining a list of values in Terraform.