1. 程序：
程序，顾名思义，是计算机用来执行特定任务的指令集或集合，这些指令是使用特定的编程语言(例如 C++、 Python、Ruby 等)创建的。
2.函数：
函数，顾名思义，是计算机编程中的基本概念，调用它来控制程序流以及执行特定任务，返回一个值并在调用它的地方恢复程序。
程序与函数的区别：
| Program | Function |
|---|---|
| Programs are set of instructions executed by computer. | Function is block of organized and reusable code. |
| Programs has to instruct computer to do particular task. | Functions has to perform action or related action. |
| Programs do not return any result. | Function usually return result that can be graphed or entered in table. |
| It provides framework that set direction of program as well as plan about how objective will be achieved. | It provides better modularity for application as well as high degree of reusing code. |
| It cannot store local and global variables. | It can store local and global variables. |
| Types of programs include system programs, application programs, utility programs, etc. | Types of function include modulus function, linear function, quadratic function, exponential function, etc. |
| Program consists of compiled code that run directly from computers operating system. | Functions can be used over and over again once it is defined. |
| It is larger in size and does not require scripting engine to run. | Functions are smaller in size as compared to programs. |
| Programs are written in both low-level and high-level programming languages and are human readable and writable. | Functions can be both low-level or top-level functions. |