Programming for the Arduino - Arduino Sketches: Tools and Techniques for Programming Wizardry - page 43

An Arduino program is known as a sketch, which is like a work of art. You,
the artist, gather and assemble elements to create your masterpiece, and the
Arduino is your canvas.
In Chapter 3, you will see some of the most common electronic components,
and how to choose their values. Each will be presented, and I will explain how
to use them in your sketches.