Why and when do we use the include directive?

The include directive is used in programming and markup languages to incorporate content from one file into another, promoting code reuse and modularity. It is commonly utilized in server-side scripting languages like PHP, as well as in HTML for templates, to dynamically load headers, footers, or other shared components. This directive is particularly useful during the development phase when changes need to be made in one place without affecting multiple files, streamlining maintenance and updates. Typically, it is used whenever repetitive code or content is needed across multiple files.