Pens are writing instruments that use ink to make marks on paper or other surfaces. There are many types of pens, including ballpoint pens, fountain pens, rollerball pens, gel pens, and more. Pens can come in a variety of colors and point sizes, and can be used for anything from taking notes to creating art. They are commonly used in offices, schools, and homes. Pens can be made from a range of materials, including plastic, metal, and wood, depending on the desired look and feel. Whether for work or leisure, pens are essential tools for anyone who wants to express their ideas and thoughts on paper.