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## Understanding components
In Svelte, an application is composed from one or more *components*. A component is a reusable self-contained block of code that encapsulates HTML, CSS and JavaScript that belong together, written into a `.svelte` file. The 'hello world' example in the code editor a simple component.
In Svelte, an application is composed from one or more *components*. A component is a reusable self-contained block of code that encapsulates HTML, CSS and JavaScript that belong together, written into a `.svelte` file. The 'hello world' example in the code editor is a simple component.