What is an array?

In computing, particularly in the context of programming and data structures, an 'array' is a collection of elements, each identified by an index or a key. In job scheduling systems like SLURM or PBS, an 'array job' refers to submitting a batch of similar jobs that can run independently but share the same job script. This allows for efficient management and parallel execution of repetitive tasks, such as processing multiple data files or running simulations with different parameters.