Fedora Core is a distribution of Linux.
Think about linux like cars...
Linus Torvalds wrote the Linux Kernel (which is like the engine of a car), and lots of people make distributions (a full o/s with software etc) that use that kernel (like a full car based around an engine).
Fedora is a popular distribution of Linux.. it is the result of Redhat not supporting their desktop Redhat 9 anymore, so they've released the project to the community to develop with their support. Fedora is a great starting place for linux newbies, though Knoppix is even better
fedora.redhat.com
www.knoppix.net
