Workflow Components
Get to know the main orchestration components of a Kestra workflow.
Flow
Flow is a container for tasks and their orchestration logic.
Namespace
Namespaces are a logical groupings of flows and their components.
Execution
Execute flows and view the results.
Variables
Variables are key–value pairs that let you reuse values across tasks.
Inputs
Inputs are dynamic values passed to the flow at runtime.
Outputs
Outputs let you pass data between tasks and flows.
Labels
Labels are key-value pairs in Kestra that let you organize [flows](./01.flow.md) and [executions](./03.execution.md) across multiple dimensions, without being restricted to a single hierarchy.
Plugin Defaults
Plugin defaults are default values applied to every task of a given type within one or more flows.
Subflows
Subflows let you build **modular** and **reusable** workflow components.
Errors
Kestra provides multiple ways to handle errors, helping you both identify issues and decide whether your flows should stop or continue running after an error.
Retries
Retries handle transient failures in your workflows.
Task timeout
A timeout defines the maximum duration a [runnable task](./01.tasks/01.runnable-tasks.md) is allowed to run.
Concurrency Limits
Control how many executions of a flow can run at the same time.
Descriptions
You can document flows, inputs, outputs, tasks, and triggers by adding a `description` property.
Disabled flag
The `disabled` flag is a boolean property that lets you skip a flow, task, or trigger.
States
States control the status of your workflow execution.
SLA
Assert that your workflows meet SLAs.
Finally
Define a block of tasks that always run at the end of a flow, regardless of task status.
afterExecution
Run tasks after a flow execution completes.
Task Cache
Cache the status and outputs of computationally expensive operations.