# Managing a schedule in EventBridge Scheduler
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 A *schedule* is the main resource you create, configure, and manage using Amazon EventBridge Scheduler. 

 Every schedule has a *schedule expression* that determines when, and with what frequency, the schedule runs. EventBridge Scheduler supports three types of schedules: rate, cron, and one-time schedules. For more information about different schedule types, see [Schedule types in EventBridge Scheduler](schedule-types.md). 

 When you create a schedule, you configure a target for the schedule to invoke. A target is an API operation that EventBridge Scheduler calls on your behalf every time your schedule runs. EventBridge Scheduler supports two types of targets: *templated* targets call common API operations across a core groups of services, and the *universal target parameter (UTP)* that you can use to call more than 6,000 operations across over 270 services. For more information about configuring targets, see [Managing targets in EventBridge Scheduler](managing-targets.md). 

 You configure how your schedule handles failures, when EventBridge Scheduler is unable to deliver an event successfully to a target, by using two primary mechanisms: a *retry policy*, and a *dead-letter queue (DLQ)*. A retry policy determines the number of times EventBridge Scheduler must retry a failed event, and how long to keep an unprocessed event. A DLQ is a standard Amazon SQS queue EventBridge Scheduler uses to deliver failed events to, after the retry policy has been exhausted. You can use a DLQ to troubleshoot issues with your schedule or its downstream target. For more information about, see [Configuring a schedule's dead-letter queue in EventBridge Scheduler](configuring-schedule-dlq.md). 

 In this section, you can find examples for managing your EventBridge Scheduler schedules using the console, the Amazon CLI and the EventBridge Scheduler SDKs. 

**Topics**
+ [Changing the schedule state in EventBridge Scheduler](managing-schedule-state.md)
+ [Configuring flexible time windows in EventBridge Scheduler](managing-schedule-flexible-time-windows.md)
+ [Configuring a schedule's dead-letter queue in EventBridge Scheduler](configuring-schedule-dlq.md)
+ [Deleting a schedule in EventBridge Scheduler](managing-schedule-delete.md)
+ [What's next?](#managing-schedule-whats-next)

## What's next?
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+  For more information on how you can configure templated targets for Lambda and Step Functions, and to learn about using the universal target parameter, see [Managing targets in EventBridge Scheduler](managing-targets.md). 
+  For more information about the EventBridge Scheduler data types and API operations, see the [EventBridge Scheduler API Reference](https://docs.amazonaws.cn/scheduler/latest/APIReference/).