< Common Lisp | Reference
car, along with cdr, is one of the basic building blocks of Common Lisp which are used to build cons cells.
The car operator, when applied to a list, returns the first element of that list. For example:
(car (list 1 2 3 4 5)) 1
It can be replaced by first function  :
(first (list 1 2 3 4 5)) 1