What is crontab?

Crontab is a Unix-based utility used for scheduling tasks to run automatically at specified intervals. It allows users to set up cron jobs, which are commands or scripts that execute at predetermined times, even when the user is not logged in. The scheduling is defined using a specific syntax that includes fields for minute, hour, day of the month, month, and day of the week. This makes it a powerful tool for automating repetitive tasks such as backups, system maintenance, and running scripts.