An oil paper umbrella is a type of umbrella made with a paper material that is treated with oil to make it water-resistant.
Just like how we use regular umbrellas to keep ourselves dry from the rain, people in some countries use oil paper umbrellas in the same way. The paper material is coated with oil so that it can repel water and keep the person holding the umbrella dry.
These umbrellas are also used as decorations or in traditional ceremonies because they can be very beautiful. The paper is often painted with designs or patterns, and the handle is usually made of bamboo or another strong material.
So, an oil paper umbrella is a special type of umbrella made with paper that is treated with oil to keep it waterproof. It can be used to keep people dry in the rain, as a decoration or for special ceremonies.