Midi-chlorian/Legends

Midi-chlorians are microscopic life forms that exist inside the cells of all living things including people. They are as much part of us as we are a part of them, and neither can exist without the other. Midi-chlorians themselves, however, are not the Force. They are only our link to the Force. If an individual has enough of these midi-chlorians in their bodies they can communicate, though the midi-chlorians, with the Force. So in essence midi-chlorians are the connection between our minds and the force.

A person with a high amount of midi-chlorians in them can become a Jedi. The Jedi have learned how to quiet their minds and focus so they can hear the midi-chlorians inside of them and use the force.

The Jedi look for people with large amount of midi-chlorians in their bodies, and then train the to become Jedi. The amount of midi-chlorians can be determined by a simple blood test, and often Jedi candidates are found in children of Jedi.