By default, print() puts spaces between items. The sep parameter lets you change that separator to anything you want.
Try this: python print("apple", "banana", "cherry", sep=", ") Output: apple, banana, cherry. The items are now separated by comma-space instead of just space.
You can use any string as a separator: sep="-" for dashes, sep=" | " for pipes, sep="" for no separator at all. That last one is useful when you want items to touch directly, like building a word letter by letter.