A world clock is a device that displays the current time in various locations around the globe. It helps people understand time differences between different regions, which is especially useful for international communication, travel, and business. World clocks can be found in homes, offices, and public spaces, often showing multiple time zones simultaneously. These clocks can be analog or digital and may include features like daylight saving time adjustments. Many online platforms and smartphone applications also provide world clock functionalities, allowing users to easily check the time in cities like New York, Tokyo, or London from anywhere in the world.