A sketchbook is a book or notebook containing blank pages for drawing, writing, and other forms of artistic expression. It typically has thick paper designed to handle various mediums such as pencil, charcoal, ink, watercolor, or pastel without bleeding through the page. Sketchbooks are often used by artists, designers, architects, illustrators, and other creative professionals to develop ideas, experiment with techniques, and record observations. They can also be used for personal expression, journaling, or scrapbooking.