What is hold baggage and how does it differ from carry-on luggage?

Hold baggage refers to luggage that is checked in at the airport and stored in the cargo hold of the airplane during the flight. It is typically larger and heavier than carry-on luggage, which passengers are allowed to bring into the cabin with them. Hold baggage must meet specific size and weight restrictions set by the airline, while carry-on luggage is limited in size and must fit in the overhead compartment or under the seat in front of the passenger.