In Warsaw, the public transport system is extensive and efficient, covering the city with a network of buses, trams, and metro lines. Tickets can be purchased at kiosks, directly from the driver, or through various mobile apps. Tickets need to be validated upon boarding. It's recommended to buy a 24 hour, 72 hour, or 7-day ticket if you plan to use public transport frequently during your stay. Remember that tickets are checked frequently by ticket inspectors, and fines for not having a valid ticket can be quite steep.