What are the differences between furring strips and common boards, and how do they affect their suitability for various construction projects?

Furring strips are thin, narrow strips of wood used to create a level surface for attaching materials like drywall or siding. Common boards are thicker, wider boards typically used for structural support or decorative purposes. Furring strips are better suited for projects requiring a level surface, while common boards are more suitable for structural strength and aesthetic appeal in construction projects.