Skimmers are devices used by criminals to illegally collect information from credit and debit cards. They are often placed over card readers at ATMs or gas stations, making it easy for unsuspecting users to unknowingly swipe their cards through the skimmer. The device captures the card's magnetic stripe data, which can then be used for fraudulent transactions. In addition to skimmers, criminals may also use hidden cameras to record PIN numbers as users enter them. This combination allows them to create cloned cards and access victims' bank accounts, leading to financial loss and identity theft. Awareness and vigilance can help prevent such crimes.