Flight reservations are bookings made by passengers to secure a seat on a specific flight. This process typically involves selecting a departure and arrival city, choosing travel dates, and providing personal information. Passengers can make reservations through airline websites, travel agencies, or mobile apps. Once a flight reservation is confirmed, passengers receive a confirmation number, which they can use to check in online or at the airport. It's important to review the airline's policies regarding cancellations, changes, and baggage allowances to avoid any surprises during travel.