Statements and Comments.

Statements are the elements that make up programs. The ";" (semi-colon) symbol is used to end statements. It is called the "statement terminator." Comments are used for making notes to help people better understand programs. A comment begins with two forward slashes ("//").

// The size function is a statement that tells the computer 
// how large to make the window.
// Each function statement has zero or more parameters. 
// Parameters are data passed into the function
// and used as values for specifying what the computer will do.
size(200, 200);

// The background function is a statement that tells the computer
// which color to make the background of the window 
background(102);