Keeping time, in the days before mechanical clocks.
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In Greek and Roman times, water clocks were used.
Alarm clocks are useful to keep people on track. Uses for alarm clocks or timers - waking up people, used for cooking.
Pendulums are often used in clocks to power the gears that move the hands. However, most clocks built today often have pendulums only for show, as those types of clocks are usually inaccurate and require a lot of winding.
No, that's one invention you can't pin on the Romans. The Romans did not have clocks as we know them. They used the sundial or water clocks or simply looked up at the sky. (They, like all ancient peoples, were pretty accurate at judging time from the position of the sun) The Roman numerals on clocks is a decorative touch to make them more distinguished or "classy".
They Are Both Used For Counting Time.