Caller Identification is a technology that allows phone users to see the name and number of the person calling them before they answer the call. This feature helps individuals decide whether to pick up the phone or let it go to voicemail. It is commonly used on both landline and mobile phones. The information displayed during a call is usually sourced from a database that matches phone numbers with registered names. While Caller Identification can be helpful, it is not always accurate, as some calls may come from unknown or blocked numbers, and telemarketers often use fake numbers.