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For touching or writing on the touch screen.
you can use your pen or your finger as a stylus.
If the stylus is broken, just buy some new ones, you can buy around 3 or 4 of them for £1 ($2) from online websites.
One can buy new Nintendo DS pens or stylus from stores like Game, HMV, Wilkinsons and Zavvi. One can also buy them online from Amazon, eBay and Tesco Direct.
The DS comes with at least one stylus and you can buy additional ones at various stores.
Yes there are quite a few that the stylus is completely optional.
The Nintendo DS lite is smaller and lighter then the ordinary DS it also has adjustable backlight and a thicker stylus.
The Nintendo DS Lite stylus typically measures approximately 3.5 inches (about 8.9 cm) in length. Its diameter is around 0.1 inches (about 0.25 cm). The stylus is designed to be compact and easily stored within the DS Lite console for convenience.
you can get it at gamestop the last i heard.
Nintendo offers a "Nintendo Ds Lite 5 in 1 Combo Nintendo Lite Ds Case" for your Nintendo DS. The case can hold the Nintendo DS console, and has a compartment inside that you can put NDS cartridges, GBA SP cartridges, and stylus etc.
Stylus is a pen-like material that is used for tapping screeens of touchscreen technologies like Nintendo DS.