A collection is a group of values
- your library of music on Spotify (or other music streaming service)
- clothes in your wardrobe or shoe collection
- co-ordinates on a map for a hiking route, including height & type of terrain and weather over time
Clojure has four collections that are built into the language.
Vectors and Maps are the most common data structures used in Clojure for defining and working with values.
Data structures in Clojure are used instead of defining your own types (which you would do in a language like Java, C++, Scala, etc.)