Difference between `apply map f ...` and `map f ...` in clojure

[23:43] <gfredericks> ,(def colls [[:a :b] [:c :d]])

[23:43] <clojurebot> #'sandbox/colls

[23:43] <gfredericks> ,(map list colls)

[23:43] <clojurebot> (([:a :b]) ([:c :d]))

[23:43] <gfredericks> ,(apply map list colls)

[23:43] <clojurebot> ((:a :c) (:b :d))

With `apply maf f ...` there is an unwrapping before applying.