Riga city provides public transport services, including trams, trolleybuses and buses. See route maps. To use public transport in Riga you have to buy a ticket. Tickets can be purchased at food & beverages kiosks an shops Narvesen.
There also minibuses and night buses, which run in weekend nights. They are operated by another company, “Rīgas mikroautobusu satiksme”, and have different tickets (see tickets).