This actually is quite a useful feature that Windows 10 has by default, i.e. you do not require to install any software to set an alarm on your computer. For any important meetings, or reminders you can set up an alarm at a specific time and your PC will notify you.

However, please note your PC must be in the awake state to give you the alarm notification. If you are using the PC then it will automatically be in the awake condition but if it is left on power or battery – the laptop might go to sleep and hence you can miss the alarm. Thus, the video also shows how you can turn off sleep mode for your PC so that you do not miss the alarm.