Roadracing bikes and highend Trekking or mountainbikes are equipped with the thin Presta valves. The upper top nut has to be unscrewed before inflation.
Mountainbike tubes are sometimes equipped with the robust Schrader valve. For inflation the pump head has to be pushed on the valve as far as possible to open the valves air release pin.
The classic bicycle or Dunlop valve is still the common equipment of entry level citybikes, kids bikes and hybrids.