A Chinese knot (中国结) is a knot that is woven (编织) from a single rope to be different (shape). People believe that each knot has (it) own meaning. Now, you can see it as a decoration (装饰品) or a gift for friends. People can use ropes of different colors to weave a Chinese knot, but they usually choose red it means good luck.
Chinese knots have long history. At first, people made them to record some events and send messages before they (begin) to use words. It is well-known that the knots were used for decoration and to express thoughts and feelings in the Tang Dynasty. Later in the Qing Dynasty, this art (accept) by more common people.
Even today, Chinese knots hold their value and carry different information. For example, the "double happiness knot" is given and used at weddings (婚礼)(express) each other's love and wishes growing old together. Besides that, knots are also used when people make (tradition) clothes in China. They can play the role of buttons (纽扣) and now silk is (wide) used to make these clothing knots.
It's surely a good choice for tourists to buy Chinese knots as gifts for their friends during their trips.