Final answer:
The content of another file is inserted into a program using an Include statement, which allows for code organization and reuse in programming languages like C and C++. The Import, Append, and Concatenate statements serve different purposes, such as importing modules or joining data sequences.
Step-by-step explanation:
The content of another file is inserted into a program primarily using the Include statement. In various programming languages, this statement acts as a directive to the compiler or interpreter to include the contents of one file within another. This is often seen in languages like C and C++, with the #include preprocessor directive. It allows developers to write code in separate files for better organization and reuse code by including it where necessary.
In contrast, the Import statement is commonly used in languages like Python and Java to bring in modules or packages of code, rather than entire file contents. The Append statement usually refers to adding data to the end of a file or data structure. The Concatenate statement is primarily used for joining strings, arrays, or other sequential data types end-to-end in many programming languages.