A statement is, as far as BASIC is concerned, a keyword that can be executed in run-time which doesn't return any value. It can contain several arguments or no arguments at all.
The arguments in a statement are usually not enclosed with paranteses. When a graphical x-coordinate and y-coordinate is to be specified they are enclosed with paranteses though.
Example 1: Demonstrates how x- and y-coordinates are enclosed with paranteses (in graphics).
Example 2: Demonstrates how row- and column-coordinates are not enclosed with paranteses (in text).