NASA has recently awarded three crewed flights to the ISS to SpaceX (Crew 15, 16, 17). Continuing on top of the Dragon capsule, these crewed missions will continue American crew transfer aboard the International Space Station, and will continue until the station's decomissioning in the early 2030s.
These flights are the only crewed American access to the ISS since the Space Shuttle retired in 2011.
There are two types of Dragon capsules from SpaceX. There is the Crew Dragon, which as the name suggests, carries crew and some supplies to the ISS. It also acts like a lifeboat in case of an emergency and can safely return astronauts to Earth within hours.
In addition, there is Cargo Dragon, an unmanned cargo launcher that sends consumables (food, water, air filters, etc.), science expirements, and more to dock with the ISS.
Cargo Dragon also has an unpressurized 'trunk' that can hold large station parts or items that do not require pressure around them, such as metal and plastics.
Both Cargo and Crew Dragon spacecraft will become essential for lifting humans into future space stations, especially as they are the only American crewed capsules that are built for low Earth orbit. (Orion is meant for deep space).