What is CronTrigger in Salesforce?

CronTrigger contains schedule information for a scheduled job.
CronTrigger is similar to a cron job on UNIX systems.

CronTrigger: It is similar to a cron job on UNIX systems. It is the parent job that will be run, it can have many runs attached to it.
List<CronTrigger> listCronTrigger = [select Id, OwnerId, CronExpression from CronTrigger
where CronExpression like ‘% MyJobName’];