What is commercial photography? I don't know about it. Can I be employed?

Refers to photography for commercial purposes. Private photography as opposed to personal hobbies.

In a broad sense, it includes the production of all images used to sell goods, write events or introduce books, while in a narrow sense, commercial photography usually refers to advertising photography.

For example, a studio wedding dress is not commercial photography. The purpose of this is personal. However, the wedding photos taken by the studio spokesperson for publicity belong to commercial photography.

For example, all the pictures of products and people you see in advertisements belong to the category of commercial photography.

As for the application. You should at least know something. Or just be the assistant of the cheapest studio. Try it first.