What is included in a sillcock repair kit and how can it be used to fix a leaky outdoor faucet?

A sillcock repair kit typically includes replacement washers, O-rings, and other small parts needed to fix a leaky outdoor faucet. To use the kit, you would first turn off the water supply to the faucet. Then, disassemble the faucet using the tools provided in the kit, replace the damaged parts with the new ones from the kit, and reassemble the faucet. Finally, turn the water supply back on to test if the leak has been fixed.