Answer: It is a series of instructions contained in one command that users can apply to automate complex and/or repetitive tasks
One example would be a macro that goes through a list of numbers and highlights which are duplicates. Say you had the list {1,2,3,3,4,4,4,5}. You could use one color to highlight both 3 and 4 as they repeat themselves. Or you could use different colors to show the different values. With a small list, you could highlight by hand. However, macros are more efficient with larger lists.