A clock or a timepiece is a device that is used to measure and indicate time accurately. A clock is one of the oldest human inventions. It is essential to measure intervals of time shorter than the natural units like the day, the lunar month, year, etc.
The units that are used to measure time are hour, minute, and second. There are three hands in a clock which represent the hour, minute, and second.

The tiny lines between the numbers denote minutes. There are 5 lines between the two numbers. The minute hand takes 5 minutes to move from one number to the next number.

So, when the minute hand moves from one number to another, then it moves 5 minutes.

In one full day, the hour hand completes two rounds of the dial. So, 1 day = 2 × 12 hours = 24 hours
Similarly,
1 hour = 60 minutes,
1 minute = 60 seconds.

The face of the clock is divided into 12 equal parts and each part is divided into 5 parts by tiny lines. So, there are total 12 × 5 = 60 tiny lines on the face of the clock. The hour hand, minute hand, and second-hand tell us the time from the clock.
It is explained further with examples.
Example: Read the time.

Answer:
The hour (shorter) hand points to the 12.
The minute hand points to the 3.
3 × 5 minute = 15 minutes
Hence, the time on the clock is 12 o’clock 15 minutes.
The hands of the clock move around from left to right. Some terms we used to define time. Here it is explained briefly.

Quarter past:
When the minute hand is at 3, it implies 3 × 5 = 15 minutes. This is one-quarter of an hour. The time is said to be a quarter past hour. This means 15 minutes past after one hour. The below picture it is showing a quarter past 8.

Half-past:
When the minute hand is at 6, it implies 6 × 5 = 30 minutes. This is half-past an hour. This means 30 minutes to past one hour. The below picture, it is showing half-past 1.

Quarter to:
When the minute hand is at 9, it implies 9 × 5 = 45 minutes. This is three-quarters of an hour. The time is said to be a quarter to an hour. This means 15 minutes to complete one hour. The below picture is showing quarter to 3.


AM and PM are Latin words that are used to refer to the time before midday and after midday respectively.
AM

PM

The below picture defines the time of a whole day.


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Reading time means understanding and telling the exact time shown on a clock. It involves identifying hours, minutes and seconds using the clock hands or digital time format.
To read time, check the short hand for hours and the long hand for minutes. The short hand shows the hour, while the long hand shows how many minutes have passed.
2:30 means the time is 30 minutes after 2 o’clock. It is also called half past 2 and shows that the minute hand points at 6.
Time is written in the format hours:minutes:seconds. For example, 5:25:10 means 5 hours, 25 minutes, and 10 seconds.
To read time on a clock, look at the short hand for hours and the long hand for minutes. Each number on the clock represents 5 minutes. Count the minutes from 12 clockwise to find the exact time.
7:45 can be said as "seven forty-five" or "quarter to eight" in English. It means 45 minutes past 7 o’clock or 15 minutes before 8 o’clock.
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