How to insert a record into a table with a column declared with the SERIAL function

My database is using PostgreSQL. One table is using the serial auto-increment macro. If I want to insert a record into the table, do I still need to specify that value, or it is be automatically assigned for me?

CREATE TABLE dataset
(
    id serial NOT NULL,
    age integer NOT NULL,
    name character varying(32) NOT NULL,
    description text NOT NULL DEFAULT ''::text
    CONSTRAINT dataset_pkey PRIMARY KEY (id)
);