The Kerbin Space Exploration Administration utilizes 6 different rockets to carry out a variety of mission profiles:

Launch Vehicle	Tonnage to 200k Kerbin Orbit	Typical Payload
Nebula Rocket	14 tonnes	Mk2 Nebula Crew Vehicle, smaller satellites
Nebula Heavy Rocket	50 tonnes	Larger satellites, payloads to Kerbin Spacedock, DSV payloads (landers, fuel, supply missions etc.)
Sarnus Va Rocket	70 tonnes	Aurora Missions (Mun/Minmus Landing & Return), Heavy DSV payloads
Jool X Rocket	200 tonnes	Modular Refueling Vehicles, Smaller Interplanetary Missions
Jool Heavy Rocket	300 tonnes	Larger Interplanetary Missions, Smaller Station Launches
Nova Rocket	400 tonnes	Super Heavy payloads, Larger Interplanetary Space Station Launches