The term "reed" has several meanings depending on its context.
1) In a general sense, reeds are tall grasses that grow in wetlands and along riverbanks. They have long thin leaves and grow in clusters. Examples of such plants include common reed (Phragmites australis), giant reed (Arundo donax), and papyrus (Cyperus papyrus).
2) In a musical context, "reeds" refer to the double-reed wind instruments like oboe or bassoon. These instruments use two pieces of cane that are bound together in one end and have a single reed mouthpiece at the other end. The player blows into the instrument through the reed which vibrates as air passes through it, creating sound.
3) In a historical context, "reeds" refer to long thin stems of grass that were used by ancient Egyptians for writing and painting on papyrus paper. This plant grew in abundance along the Nile River and was harvested, cut into strips, and laid side-by-side to form sheets of paper.
4) In a sporting context, "reed" can refer to a type of fishing rod or pole made from bamboo or other flexible material. These poles are used in fly fishing and have a long thin tip that is designed to cast a line with precision.