String:A string is a data type that represents text in programming. In this case, couchMaterial would likely be stored as a string since it represents different types of materials.
Concatenation: Concatenation refers to combining multiple strings together into one. In our question's example, concatenation is used to create the desired output string by joining different pieces (e.g., "The couch has ", numOfCushions, " cushions and is made of ", couchMaterial).
Output: Output refers to information that gets displayed or produced by a program. Printing the formatted information about the Couch object using concatenation would be considered an output action in this scenario.