Final answer:
The full set of commands in a programming language like App Lab is referred to as the application programming interface or API. APIs serve as toolkits for programmers, encapsulating complex operations into simpler functions, aiding in efficient application development.
Step-by-step explanation:
The full set of commands included in a programming language, such as every command made available by App Lab, is called the application programming interface or API for short. An API includes the definitions of the functions, classes, and variables that a programmer can use to perform specific tasks or interact with an application or operating system. It acts as a toolkit for programmers, encapsulating complex operations into simpler callable functions. For example, an API for a drawing program might include commands for drawing shapes, selecting colors, and saving the artwork. These commands simplify the underlying complexities of the graphical operations and allow the programmer to build their applications more efficiently and with less direct interaction with the low-level code.