Time zones are just like standard meridian for example India has one standard meridian means 1 time zone and Russia is a big country so it has 11 time zones

Time Zones
Time zones are regions of the Earth that have the same standard time. There are 24 time zones in the world, each representing a different hour of the day. Time zones are based on the Earth's rotation and are divided into longitudinal lines.

Explanation
- Time zones are necessary because the Earth rotates on its axis, causing different parts of the world to experience daylight and darkness at different times.
- The Prime Meridian, located at 0 degrees longitude, serves as the reference point for calculating time zones. Each 15-degree interval from the Prime Meridian represents one hour of time difference.
- Time zones are usually centered around a standard time, such as Coordinated Universal Time (UTC), which helps coordinate activities and schedules across different regions.
- Countries may have multiple time zones within their borders, depending on their longitudinal spread. For example, Russia spans multiple time zones, while smaller countries may only have one time zone.
- Daylight Saving Time is a practice where clocks are adjusted forward by one hour during the warmer months to make better use of daylight. Not all countries observe Daylight Saving Time.

Importance
- Time zones help regulate activities such as travel, communication, and international business by providing a standard reference for time.
- Understanding time zones is crucial for coordinating events, meetings, and schedules across different regions of the world.
- Time zones also play a role in determining sunrise and sunset times, which can impact daily routines and activities.