Pens are tools that apply ink to a surface and are used for writing, drawing, and calligraphy.
The original pens did not hold ink and needed to be dipped into a well first in order to leave a mark on the page. The Declaration of Independence and other historical documents were written using this exact method. These types of pens can include dip pens (or nib pens) and are now used primarily for illustration, calligraphy and comics; traditional ink brushes, often used in Asian art and calligraphy; quills or feather pens; and reed pens cut from reeds or bamboo.
The pens we commonly use today are designed to hold their own ink and can be easily identified by their writing tip and the type of mark they leave. The most common is the ballpoint pen which has a small hard sphere at its tip to dispense water-based liquid or gel ink with a similar mechanism as a ballpoint pen. Fountain pens feed water-based liquid ink through a thin slit. Markers, known as felt-tip pens, offer a porous tip of fibrous material that can deliver bold permanent or non-permanent ink for a variety of uses. A pen’s ink is no longer bound by blue or black, it can be produced in almost any color.
Wikipedia: Ink - Background and uses of ink.
What Is Sumi-e? - Japanese word for Black Ink Painting. East Asian Painting and writing developed together in ancient China using the same materials —brush and ink on paper.
How to use Copic Markers - Copic markers are available in 358 permanent, non-toxic, alcohol-based ink colors and are refillable using standard color ink refills.
Wikipedia: Calligraphy - Tools and traditions related to calligraphy.
The Beginner’s Guide to Modern Calligraphy - Modern Calligraphy ranges from functional inscriptions and designs to fine-art pieces where the letters may or may not be readable.
How to write calligraphy -Calligraphy is a visual art related to writing. It is the design and execution of lettering with a broad tip instrument, brush, or other writing instruments.
Art-Is-Fun.com - Everything you need to know about pen and ink drawings.