Padlocks are the only type of lock that is typically not permanently attached to anything else. Padlocks come in a range of sizes, are free standing and portable, and are one of the most easily recognizable types of lock. Padlocks are available in various case sizes and brass or stainless steel shackle sizes. Padlock is a detachable lock hanging by a pivoted hook on the object fastened.
Padlocks come in two main varieties: combination and keyed
Combination Padlocks have one or more number dials that open the lock when the correct combination is entered. They are often easy to decode or shim open. Keyed padlocks have several options to consider. There are rekeyable and non-rekeyable padlocks. If a padlock is non-rekeyable, then it’s impassible to change the key that opens the lock (for example to make it use the same key as your house).
Padlocks can be key-retaining or non-key-retaining. A key-retaining padlock does not allow the key to be removed while the padlock is open. Finally, padlocks can have a shrouded shackle. This is an extension of the body where the shoulders of the padlock raise up the sides of the shackle to make it far harder for bolt cutters to cut the padlock.