Advanced Placement (AP) Computer Science 2025 – 400 Free Practice Questions to Pass the Exam

A list in programming is typically characterized by being a sequence of items that can vary in type. This means that a list can contain elements of different data types, such as integers, strings, or even other lists. This flexibility allows for more complex data structures and manipulation, making lists versatile for various programming tasks.

The nature of lists enables programmers to group related data together, whether those items are of the same type or different types. This is particularly useful in applications where collections of heterogeneous data need to be managed, such as storing a list of students with their names (strings), ages (integers), and grades (floats).

In contrast to other options, a collection of unique variables would suggest a set or a structure imposing uniqueness, while compiler directives are instructions to the compiler that do not correspond to data structures. A mathematical expression with no duplicates points to a different concept entirely, focused on operations rather than data structures for storing multiple values.