A padlock is a type of lock that is used to lock a door, cabinet, bike, or other object using a padlock mechanism. It consists of a cylindrical housing with a movable shackle that can be inserted through a hole in the housing. When the shackle is inserted, the lock cannot be opened without the correct key.

Padlocks are often used to lock bikes or to secure doors or cabinets. They are easy to use and can be carried when not in use. There are various types of padlocks depending on their security level and the material they are made of. Some padlocks are made of steel or plastic and are resistant to heavy loads, while others are made of lighter materials and provide less security. Padlocks can also be locked with a key or with a combination lock.