Quill pens are one of the oldest type of pens. A quill pen is the feather of a bird, usually a goose. The end of the feather (the quill) was kept very sharp and had to be dipped into ink after every few words.
Reed and quill pens are dip pens because they have to be dipped in ink many times during writing or drawing. Modern dip pens have nibs made of metal.
Fountain pens are like dip pens, but can hold enough ink inside to write several pages before being refilled. Inside, the ink is held in a sac or cartridge.
A ballpoint pen is generally cylindricalplastic shaft with a smaller shaft that holds ink. It has a very small metal ball on the writing end that rolls the ink onto the paper.
A stylus is a pen that cannot write on paper and is usually made out of plastic. They are usually used with touchscreens.
The coming of the personal computer much reduced the need to write on paper. All the same, a personally written letter suggests "I think so much of you that I took the effort to write a real letter.