1. Durability: Ordinary crayons are usually disposable, and once they are used up, they cannot be used again. Erasable crayons can be reused. As long as the crayon head is not worn out, you can continue to write or draw.
2. Erasability: Erasable crayons are special in that their crayon heads are made of special materials and can leave lasting marks on paper. Moreover, this trace will disappear after being wiped with a wet cloth, so it is called "erasable". The crayon head of ordinary crayons is ordinary wax, which can't leave lasting marks on paper.
3. Applicable people: Erasable crayons are durable and erasable, and are more suitable for occasions that need to be repeatedly altered or colored, such as students doing homework and teachers correcting test papers. Ordinary crayons may be more convenient and economical for occasions where you only need to use them once.