The clocks we use today divide the day into two 12-hour cycles. This is because there are a total of 24 hours in a single day, which can be divided into two 12-hour periods.
It might be strange for some people, considering that when you look at the clocks, they display just enough time to account for one of two 12-hour periods.
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To solve this problem, the two separate periods can be shown on the same analog clock using the AM and PM suffixes. Understand What does AM and PM mean?:
the acronym AM means "ante meridiem" or 'before midday' in Latin, so it is used to describe the first part of the day - the first 12 hours, starting at (00:00) and ending at 11:59.
On the other hand, PM means “post meridiem” or ‘after midday' in Latin and is used to describe the second part of the day - the final 12 hours, starting at (12:00) and ending at 23:59.
That's why time is labeled with the suffix AM or PM; so that we can identify which part of the day the time reference belongs to. Today, most of the world uses a 24-hour clock, while many English-speaking countries follow a 12-hour clock.
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