A reminder is a prompt or notification designed to help someone remember an event, task, or piece of information at a specific time or under certain conditions. Reminders can be created and delivered through various means, such as:

1. Personal Reminders:

1. Writing notes or to-do lists.
2. Setting an alarm or alert on a device.
3. Using a calendar to schedule tasks or appointments.

2. Digital Reminders:

1. Notifications from apps like calendars, task managers, or reminder apps (e.g., Google Calendar, Microsoft To-Do).
2. Email or SMS reminders sent automatically.
3. Smart assistants like Alexa, Siri, or Google Assistant providing alerts.

3. Visual or Physical Reminders:

1. Post-it notes placed in strategic locations.
2. Objects intentionally placed to trigger memory (e.g., a packed bag by the door to remember to take it).

Reminders are particularly useful for time-sensitive tasks, important dates, or routine activities and can be customized to fit personal needs and schedules.