What is the main use of sketch paper or newsprint?

The primary use of sketch paper or newsprint is indeed for sketching due to its thinner quality. Sketch paper is designed for quick studies and preliminary drawings, allowing artists to capture ideas and concepts in a spontaneous manner. Its lighter weight and less textured surface make it ideal for practicing techniques, experimenting with composition, or jotting down any creative thoughts without the need for precision. This type of paper is less expensive than high-quality drawing or watercolor paper, encouraging artists to freely explore their ideas without the constraint of preserving a finished piece.

While options regarding detailed illustrations, long-term archival purposes, and color preservation address important aspects of art materials, they do not align with the primary function of sketch paper, which is meant for temporary and informal use during the initial stages of the artistic process.