A time zone is an area that observes a uniform standard time for legal, commercial, and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude because it is convenient for areas in frequent communication to keep the same time.
On your WordPress site, it is important to set the correct timezone to ensure that your website operates according to the appropriate local time. This is particularly important if you schedule posts or events or if you have a global audience in different time zones.
WordPress uses the timezone_string option to get a proper timezone name if available, otherwise falls back to a manual UTC ± offset.