A listing or program listing is a printed list of lines of computer code or digital

Digital

A digital system is a data technology that uses discrete values. By contrast, non-digital systems use a continuous range of values to represent information...

 data

Data

The term data refers to qualitative or quantitative attributes of a variable or set of variables. Data are typically the results of measurements and can be the basis of graphs, images, or observations of a set of variables. Data are often viewed as the lowest level of abstraction from which...

 (in human-readable form). In the early days of programming, it was used to hand-check a program

Computer program

A computer program is a sequence of instructions written to perform a specified task with a computer. A computer requires programs to function, typically executing the program's instructions in a central processor. The program has an executable form that the computer can use directly to execute...

 and as permanent storage. It was also common in 1980s computer enthusiast magazines. Today, it is seldom used because display screens can present more lines than formerly, programs tend to be modular, storage in soft copy

Soft copy

Soft copy and hard copy are types of output.A soft copy is the unprinted digital document file. This term is often contrasted with hard copy...

 is considered preferable to hard copy

Hard copy

In information handling, a hard copy is a permanent reproduction, or copy, in the form of a physical object, of any media suitable for direct use by a person , of displayed or transmitted data...

, and digital material is easily transmitted via networks, or on disks or tapes. Furthermore, data sets tend to be too large to be conveniently put on paper, and they are more easily searched in soft-copy form. In selected environments, such as classified or other highly secure documentation, listings may still be used for secure transmission or storage.
Program listing are simply a list of statements produced by a computer program as a result of compilation (M2 )

Listings are still used in education

Education

Education in its broadest, general sense is the means through which the aims and habits of a group of people lives on from one generation to the next. Generally, it occurs through any experience that has a formative effect on the way one thinks, feels, or acts...

 and computer-related book

Book

A book is a set or collection of written, printed, illustrated, or blank sheets, made of hot lava, paper, parchment, or other materials, usually fastened together to hinge at one side. A single sheet within a book is called a leaf or leaflet, and each side of a leaf is called a page...

s to show examples of code.