But it is special information. When you tweak it, unlike a letter that is passive before your eyes, a program does things for you, manipulating other information. A word processor is a program for manipulating text, writing it, erasing it, sorting it, and so on. A computer game is a program that generally allows you to manipulate scenes and circumstances that you see on your monitor, ranging from a game of chess to a simulation of a planet's history. A database program is for manipulating large stores of carefully organized information, such as a mailing list, for example.
Different programs have different functions.
Programs each specialize in some function or class of functions. Most programs have a great many features that most people not only never use, but never even know exist. Sometimes this is fine. You may use a word processor for letters, etc., and have no inkling of some of the amazing things it can do such as calculating equations or updating content based on what is done in some other program to some other information, but also have absolutely no use for such features. Since you are reading this, you have a link to the Internet.