Boomer,
If you live in a shed, then a padlock is the lock that you put on your pad!
If you are serious, a padlock is a small lock with a shackle that can be locked through a hasp or chain to secure something. (like a shed)
www.padlocks.com or similar may yield some pictures for you. If you would like to pick them as a hobby, then you have come to the right place. Read the MIT guide, FAQs and anything else you can get your hands on!
...don't forget to read the rules as well!
