Why is tin usually sold as ingots or pigs?

Tin is typically sold in the form of ingots or pigs because these shapes are convenient for storage, transportation, and further processing.12

An ingot is a mass of metal cast into a specific size and shape—such as a bar, plate, or sheet—that facilitates handling. Similarly, a "pig" refers to a crude casting of metal. These forms serve as the essential starting material for various industrial applications, whether the tin is to be alloyed with other metals, converted into different physical forms, applied as a protective coating to other surfaces, or processed into chemical compounds.13