What best defines an algorithm?

An algorithm is best defined as a step-by-step procedure for solving a problem. This definition emphasizes the systematic approach required to arrive at a solution or achieve a specific outcome. An algorithm consists of a series of defined steps that can be followed to perform calculations, process data, or automate tasks.

Understanding algorithms is fundamental to computer programming, as they form the backbone of how programming languages implement logic and solve problems. They can be represented in various forms, including natural language, pseudocode, or flowcharts, and are not limited to programming code alone.

On the other hand, other options describe concepts that do not capture the essence of what an algorithm is. A single line of code executed refers to a specific implementation rather than a broader procedure. A programming error denotes a mistake in the code, not a systematic approach to problem-solving. A type of data structure represents a method of organizing data rather than a process or set of instructions for resolving a specific task. Thus, the choice highlighting a step-by-step procedure aptly encapsulates the nature and function of algorithms in computing.