Short answers, pulled from the story.
The Apollo spacecraft was composed of three parts: the command module, the service module, and the Apollo Lunar Module. Two additional components, a spacecraft-LM adapter and a launch escape system, were added to complete the assembled stack for launch.
North American Aviation, later renamed North American Rockwell, built the Apollo command and service module.
The Grumman Aircraft Company designed and built the Apollo Lunar Module, the vehicle described as the first true spaceship because it flew solely in the vacuum of space.
During Apollo 7, one of the four spacecraft-LM adapter panels failed to open to its full 45-degree angle while the crew practiced a rendezvous with the discarded S-IVB stage. Astronaut Wally Schirra compared the sight to the angry alligator the Gemini 9 crew had once faced, and the incident led to a spring-loaded hinge redesign.
Saturn V rockets launched eight crewed lunar missions using the complete Apollo spacecraft. Saturn V also launched one crewed lunar mission using only the command and service module and one crewed low Earth orbit mission using the complete spacecraft.
After the Apollo program concluded, four more Apollo command and service modules launched on Saturn IB rockets. Three supported the Earth-orbiting Skylab missions and one flew the Apollo-Soyuz Test Project.