A Chinese knot (中国结) is woven (编织) with a single rope (绳). It has different shapes. Each shape has its own meaning. People can use ropes of different colors to weave a Chinese knot, but they usually use red because it means good luck.
The Chinese knot, a folk art, has a long history. People first made them to record information and send messages before they started to use words. The knots were used for decoration (装饰) and to express thoughts and feelings in the Tang Dynasty. They were later popular in the Ming and Qing dynasties. But this art wasn't really accepted by the common people until the Qing Dynasty.
Even today, Chinese knots still hold the value of feelings when they are sent as gifts. For example, lovers may give a knot to show their love. The "double happiness knot" is given and used at weddings (婚礼) to express each other's love and wishes for growing old together.
Knots are also used when people make traditional clothes in China. They can play the role of buttons (纽扣) and now silk is widely used to make these clothing knots.
Many tourists including foreigners like to buy Chinese knots as gifts during their trips. There are many shopping streets for people to buy Chinese knots. Yiwu Commodity Market in Zhejiang Province is a good place for that. There are many different kinds of beautiful Chinese knots there. They are popular with customers.