The explanation of usage is as follows:

The term "usage" is usually used to describe the purpose for which something or something is used or the scenario in which it is applied. It has a relatively broad meaning and can cover a variety of different fields and industries.

In our daily lives, many of the objects we come into contact with can be categorized as having a particular use. For example, a chair is used to sit on, a table is used to hold objects, and a car is used to transport people and objects. Similarly, in industry and commerce, many products have a specific use. For example, a machine is used to produce a certain product, a chemical is used to make another chemical, and an agricultural machine is used to plant and harvest crops.

In the field of science and technology, the word "use" also has an important meaning. For a new technology or scientific discovery, it is important to understand its possible uses and applications. Such uses can be the solution of practical problems, such as improving medical technology, increasing energy efficiency, developing new communication technologies, and so on. It can also be a theoretical exploration, such as studying new physical phenomena, developing new mathematical theories, etc.

In addition, "use" can be used to describe the application of a method or strategy. For example, in the field of education, the use of a teaching method may vary depending on how it is used to teach different subjects and different age groups. In business, the use of a marketing strategy can vary depending on how it is used to promote different products and services.

Overall, "uses" are an important way of describing and categorizing things that allow us to better understand and make use of the world around us. The meaning of "use" may vary in different domains and contexts, but in general it is used to describe the purpose or application of something or its use.