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This is a code written in Dr Racket. Why it uses cons and what cons does? ; contract: insert: l ( list of numbers )

This is a code written in Dr Racket. Why it uses cons and what cons does?
; contract: insert: l(list of numbers) val(number) list of numbers
; test
; function
(define (insert 1val (cond ((empty? l)(list val))
(( val (first l))(cons val l)) ; insert it to the list
(else (cons (first l)(insert (rest l) val))); do not insert the value, but
add first of 1 not to remove element from the list
)
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