40 lines
2.5 KiB
Markdown
40 lines
2.5 KiB
Markdown
---
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title: Core Concept
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---
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KubeVela revolves around cloud-native application delivery and management scenarios. The application delivery model behind it is [Open Application Model](../platform-engineers/oam/oam-model), or OAM for short. It describes various components and operational traits required for application as a unified, and infrastructure-independent "deployment plan". As a result, we can achieve standardized and efficient application delivery in a multi-cloud/hybrid-cloud environment. KubeVela includes the following core concepts:
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## Application
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An application defines the delivery and management requirements of an artifact (binary, Docker image, Helm Chart...) or cloud service included in a microservice business unit. It consists of four parts: [Component](#component), [Trait](#trait), [Workflow](#workflow) and [Policy](#policy).
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### Component
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Component defines the artifact of application，The best practice is to having one core component and subordinate components around it. Its type decided by [Component Definition](../platform-engineers/oam/x-definition#componentdefinition) .
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### Trait
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Traits are plugable operations that can attach to Component, for example: scaler for replicas(manual and auto), PVC, gateway, DNS and so on. You can draw out-of-box Trait from the ecosystem or simply customize by [Trait Definition](../platform-engineers/oam/x-definition#traitdefinition).
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### Workflow
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Workflow allows you to define critical step in the process of application delivery, typical steps will be manual approve, data passing, release across multi-cluster, notification and etc. Its type can be defined and customized by [Workflow Step Definition](../platform-engineers/oam/x-definition#workflowstepdefinition).
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### Policy
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Policy defines a strategy of certain aspect for application as to quality assurance, security, firewall rules, SLO and etc. Its type can be defined and customized by [Policy Definition](../platform-engineers/oam/x-definition#policydefinition).
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## Cluster
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Import and manage your Kubernetes cluster in KubeVela。Kubernetes cluster is one of the main way for KubeVela application delivery.
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## Addon
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Addon is where you can freely pull in third-party capability that fulfills your need. This relies on the highly scalable design pattern of KubeVela. Each Addon will have its own [X-Definition](../platform-engineers/oam/x-definition).
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## Next Step
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- View [Architecture](./architecture) to learn the overall architecture of KubeVela.
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