Final answer:
The line of code 'void loop()' is part of a function definition in Arduino programming. It defines a function 'loop' that runs repeatedly after the 'setup()' function, used to perform tasks or respond to inputs continuously. This is a fundamental concept in programming interactive devices with Arduino.
Step-by-step explanation:
The line of code void loop() { is part of a function definition in the programming world. Specifically, it is a function definition that is commonly seen in Arduino programming, which is a platform often used for building digital devices and interactive objects that can sense and control the physical world.
In this case, void loop() defines a function named 'loop' which returns no value, as indicated by the keyword 'void'. This 'loop' function is called repeatedly by the Arduino system after the 'setup()' function completes. Within the curly braces {}, you would place the code that you want to run over and over again. The loop function is essential in many Arduino sketches, as it allows the program to respond continuously to inputs or to perform tasks repeatedly.