Data types

I have been reading up on table creation with postgres but
cannot see anything on data types. I have been looking at
http://www.postgresql.org/idocs/index.php?tutorial-table.html

and if gives an example..

CREATE TABLE weather (
city varchar(80),
temp_lo int, -- low temperature
temp_hi int, -- high temperature
prcp real, -- precipitation
date date
);

what is real?
Is there a list of data types?

Kind regards
Kevin
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Kevin Waterson
Port Macquarie, Australia