A more thorough explanation:

A multiple-class application is a type of trademark application where an applicant can apply for multiple classes of goods or services under one application. For example, if a company wants to trademark their brand name for both clothing and cosmetics, they can file a multiple-class application instead of filing separate applications for each class.

ABC Company wants to trademark their brand name "ABC" for both clothing and cosmetics. Instead of filing two separate applications, they file a multiple-class application for both classes of goods.

This example illustrates how a multiple-class application can save time and money for applicants who want to protect their brand across multiple classes of goods or services.