"What's O'Clock" refers to the question people ask to find out the current time. It is commonly used in everyday conversation and can be answered by stating the hour and minutes, such as "It's three o'clock" or "It's half past two." Knowing the time helps individuals manage their daily activities and schedules. Clocks and watches are the primary tools used to tell time. They come in various forms, including analog clocks with hands and digital displays. The concept of timekeeping has evolved over centuries, with inventions like the sundial and mechanical clock playing significant roles in its development.