What is the full form of AM and PM

AM: Anti Meridiem, PM: Post Meridiem

AM and PM both are Latin words, used in 12-hour clock system to represent Before Noon and After Noon. They are also represented as A.M. and P.M.

AM expand as Anti Meridiem which means "before midday" and PM expand as Post Meridiem which means "after midday".

They are used to differentiate the time in day and night in the 12-hour time zone. For example: If I say that I will come at 6 O'clock so it may be confusing that it is 6 O'clock morning or 6 O'clock evening. Thus, to remove this confusion, AM and Pm is used in 12-hour clock system.

AM: It represents time from midnight to noon. (12:00 AM to 11:59 AM). For example: If you say that you have to go college at 10 AM, it means 10 O'clock in the morning.

PM: It represent time from noon to just before midnight. (12 Pm to 11:59 PM). For example: If you say that you have to take dinner at 10 PM, it means 10 O'clock in the night.