Lists are a crucial feature in Lisp. They are what hold all your Lisp code (as well as data) together. Take any basic piece of Lisp code, such as the following:
(expt 2 3)
This piece of code contains a symbol (
expt) and two numbers, all tied together as a list, indicated by the parentheses.
You can think of a Lisp program as a house. If you were to build a house in Lisp, your walls would be made out of lists. The bricks would be made out of symbols, numbers, and strings. However, a wall needs mortar to hold it together. In the same way, lists in Lisp are held together by structures called cons cells.
Lists in Lisp are held together ...