In this chapter, we'll examine some of OCaml's built-in data types, including lists, variants, records, tuples, and options. Many of those are likely to feel familiar from other programming languages. We'll learn about pattern matching, which is a feature that's less likely to be familiar.

Then we will see how we can define our own algebraic data types, and how many of OCaml's built-in data types would not have to be built-in, but are actually definable with algebraic data types.

We'll also examine how to define data types for trees and maps using various combinations of the above features.

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