A World Clock is a device or tool 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 physical formats, like wall-mounted clocks, or as digital applications on smartphones and computers. Many world clocks show the time in major cities, such as New York, London, and Tokyo, often using a 24-hour format. They may also indicate whether it is day or night in each location, helping users plan activities across time zones.