A Cron Expression is a string that represents a schedule for running tasks automatically at specified times. It is commonly used in systems like Unix and Linux to automate repetitive jobs, such as backups or system maintenance. The expression consists of five or six fields that define the minute, hour, day of the month, month, day of the week, and optionally the year. Each field in a Cron Expression can contain specific values, ranges, or special characters to indicate frequency. For example, an expression like "0 12 * * 1" means the task will run at noon every Monday. Understanding these expressions allows users to efficiently manage scheduled tasks.